Does your homemade mask work?

Ti Vla/Shutterstock

Simon Kolstoe, University of Portsmouth

If a surgeon arrived at the operating theatre wearing a mask they had made that morning from a tea towel, they would probably be sacked. This is because the equipment used for important tasks, such as surgery, must be tested and certified to ensure compliance with specific standards.

But anyone can design and make a face covering to meet new public health requirements for using public transport or going to the shops.

Indeed, arguments about the quality and standard of face coverings underlie recent controversies and explain why many people think they are not effective for protecting against COVID-19. Even the language distinguishes between face masks (which are normally considered as being built to a certain standard) and face coverings that can be almost anything else.

Perhaps the main problem is that, while we know that well-designed face masks have been used effectively for many years as personal protective equipment (PPE), during the COVID-19 outbreak shortages of PPE have made it impractical for the entire population to wear regulated masks and be trained to use them effectively.

As a result, the argument has moved away from wearing face masks for personal protection and towards wearing “face coverings” for public protection. The idea is that despite unregulated face coverings being highly variable, they do, on average, reduce the spread of virus perhaps in a similar way as covering your mouth when you cough.

But given the wide variety of unregulated face coverings that people are now wearing, how do we know which is most effective?

The first thing is to understand what we mean by effective. Given that coronavirus particles are about 0.08 micrometres and the weaves within a typical cloth face covering have gaps about 1,000 times bigger (between 1 and 0.1 millimetres), “effectiveness” does not mean reliably trapping the virus. Instead, much like covering our mouths when we cough, the aim of wearing cloth coverings is to reduce the distance that your breath spreads away from your body.

The idea is that if you do have COVID-19, depositing any virus you may breathe out on either yourself or nearby (within one metre) is much better than blowing it all over other people or surfaces.

So an effective face covering is not meant to stop the wearer from catching the virus. Although from a personal perspective we might want to protect ourselves, to do so we should be wearing specially designed PPE such as FFP2 (also known as N95) masks. But, as mentioned, by doing so we risk creating mask shortages and potentially putting healthcare workers at risk.

Instead, if you want to avoid catching the virus yourself, the most effective things to do are avoid crowded places by ideally staying at home, don’t touch your face, and wash your hands often.

Two simple tests

If effectiveness for face coverings means preventing our breath travelling too far away from our bodies, how would we go about comparing different designs or materials?

Perhaps the easiest way, as demonstrated by several increasingly shared pictures or videos on social media, is to find someone who “vapes” and film them breathing out the vapour while wearing a face covering. One glance at such a picture dispels any suggestion that these face coverings stop your breath escaping.

Instead, these pictures show that your breath is directed over the top of your head, down onto your chest, and behind you. The breath is also turbulent, meaning that although it does spread out, it doesn’t go far.

In comparison, if you look at a picture of someone not wearing a face covering, you will see that the exhalation goes mostly forward and down, but a significantly further distance than with the face covering.

Such a test is probably ideal for examining different designs and fits. Do coverings that loop around the ears work better than scarves? How far under your chin does a covering need to go? What is the best nose fitting? How do face shields compare to face masks? These are all questions that could be answered using this method.

But, in conducting this experiment, we should appreciate that “vaping” particles are about 0.1 to 3 micrometres – significantly bigger than the virus. While it is probably fair to assume that the smaller virus particles will travel in roughly the same directions as the vaping particles, there is also the chance that they may still go straight forward through the face covering.

To get an idea of how much this might happen, a simple test involving trying to blow out a candle directly in front of the wearer could be tried. Initially, the distance coupled with the strength of exhalation could be investigated, but then face coverings made from different materials and critically with different numbers of layers could be tried. The design of face covering that made it hardest to divert the candle flame will probably provide the best barrier for projecting the virus forward and through the face covering.

Trying to blow out a candle using different masks.

Without any more sophisticated equipment, it would be difficult to conduct any further simple experiments at home. However, combining the above two tests would provide wearers with a good idea about which of their face coverings would work the best if the aim was to avoid breathing potential infection over other people.

Simon Kolstoe, Senior Lecturer in Evidence Based Healthcare and University Ethics Advisor, University of Portsmouth

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Alleged Bomber of Christian Boy in Israel to Stand Trial

Hearing could determine whether Jack Teitel is transferred from mental hospital.

ISTANBUL, September 3 (CDN) — An Israeli man accused of planting a homemade bomb that almost killed the son of a Messianic Jewish pastor in Ariel, Israel has been declared competent to stand trial.

Jack Teitel, 37, who in November was indicted on two charges of pre-meditated murder, three charges of attempted murder and numerous weapons charges, is expected to enter a plea on Sunday (Sept. 5).

David and Leah Ortiz, parents of the teenage victim, said that the 10 months since the indictment have been difficult but their stance toward Teitel remains the same; they have forgiven him for the attack but want him to face justice before a judge and seek salvation from God.

If nothing else, they said, they want him incarcerated to keep other Messianic Jews from being attacked either by Teitel or those following his lead.

“He’s dangerous,” Leah Ortiz said. “He’s an extremely dangerous person. He’s totally unrepentant.”

Sunday’s plea will open the way for a trial expected to start within weeks and last for more than six months. Officials at a hearing possibly the same day as the scheduled plea will decide whether Teitel will be moved from the mental hospital where he has been held for most of his detainment.

It is possible Teitel will enter no plea on Sunday. He has publically stated that he doesn’t “recognize the jurisdiction” of Jerusalem District Court.

 

Bombing

On March 20, 2008, Ami Ortiz, then 15, opened a gift basket that someone had left anonymously at his family’s home in Ariel. The basket disappeared in a massive explosion that destroyed much of the Ortiz home and shattered Ami’s body.

When he arrived at the hospital, Ami was clinging to life. He was bleeding profusely, had burns covering much of his body and was full of needles, screws and glass fragments the bomb-maker had built into the device.

The doctors had little hope for him and listed his condition as “anush,” meaning his soul was about to leave his body.

After countless hours of surgery and even more spent in prayer, Ami went from “near dead,” to burned and blind and eventually to playing basketball on a national youth team. Both his parents said his recovery was nothing short of a miracle from God.

 

‘Most Radical Evangelist’

When Teitel was arrested in October 2009, police found him hanging up posters celebrating the shooting of two teenagers at a gay and lesbian community center in Tel Aviv.

Teitel’s background is still somewhat of a mystery. An emigrant from the United States, he became an Israeli citizen in 2000, got married not long afterwards and is the father of four children. Usually portrayed in Israeli media as part ultra-orthodox ideologue and part fringe survivalist, it is clear that Teitel was motivated by a fascination with end-times prophecy and an extremely violent interpretation of Judaism and Jewish nationalism.

He is a self-described follower of such anti-missionary groups as Yad L’Achim. According to authorities, Teitel sought to kill those he deemed enemies of traditional Judaism: Palestinians, homosexuals, liberal Jewish intellectuals and, in the Ortiz case, Messianic Jews.

David Ortiz is well known in Israel, both for his activities in the Jewish community and for his efforts to expose Palestinians to the gospel.

“He said the reason why he wanted to kill me was that I was the most radical in evangelism, so I had to be first,” said Ortiz, who has seen transcripts of Teitel’s confessions.

Along with the Ortiz case, police said Teitel is responsible for the June 1997 shooting death of Samir Bablisi, a Palestinian taxi driver who was found in his cab with a single bullet wound to his head. Two months later, police said, Teitel allegedly shot Isa Jabarin, a Palestinian shepherd who was giving him driving directions to Jerusalem.

Police also said that Teitel attempted to burn down a monastery and unsuccessfully planted several bombs. He also is accused of the September 2008 bombing of Zeev Sternhell of Hebrew University in Jerusalem. The bombing left the emeritus history professor slightly wounded.

During one court hearing, Teitel flashed a victory sign and reportedly said, “It was a pleasure and honor to serve my God. God is proud of what I have done. I have no regrets.”

 

Long Road to Trial

David Ortiz said that as bad as the bombing itself was, waiting for the trial has been yet another ordeal.

As officials investigated the bombing, police harassed Messianic Jewish friends of theirs, saying, “If you are Jewish, why did you become a Christian?” Ortiz said.

The Ortiz family had to sue police and pay 5,000 shekels (US$1,320) to obtain a copy of a security camera video belonging to the family that police had seized as evidence. The video shows Teitel laying the basket at the Ortiz home.

“We had to hire a lawyer because we understood clearly that our rights as victims had to be protected,” said David Ortiz.

Particularly galling to the pastor has been the hands-off response of government officials to the attack.

“We are the only family in Israel that has been a victim of an attack that hasn’t been visited by a government official,” he said, adding that officials have made no public condemnation of the attack. “If the leaders do not condemn an act, it emboldens others who want to do the same thing.”

According to the International Religious Freedom Report 2009 issued by the U.S. Department of State, there are 10,000 Messianic Jews in Israel. The report documents several cases of violence against Messianic Jews, including cases where baptismal services have been disrupted, Messianic Jews have been beaten and Christian literature has been torched.

 

God Shows Up

Leah Ortiz said that what Teitel intended for evil, God meant for good in order to reach people.

“The Lord has taken the worst tragedy that could possibly happen and has used it for the greatest good that He possibly could,” she said.

The incident, and how the Ortiz family has dealt with it, has become a lightning rod of sorts in Israel, forcing people to think more seriously about the claims of the Messianic Jews.

In a place filled with the type of hatred that causes people to strap bombs to their bodies to kill others, the attack has given people a reason to think and, for some, to choose forgiveness and peace.

Ortiz said he has gotten calls from Palestinians who had said if he could forgive a man who bombed his child, then they can forgive what has happened to them. Orthodox Jews have called him and asked forgiveness for their hatred toward Messianic Jews. Muslims have called Ortiz offering blood for transfusions for Ami.

Ortiz said he was devastated after the attack, but that he has been blessed to see God working “supernaturally” through the incident. Ami is an example of God’s grace and healing power, Ortiz said, explaining, “Ami has been a wonder within my own eyes. How could anyone who went through so much be so peaceful?”

Ami’s high school friends, most of them not Messianic Jews, have sought him out and asked him about the ordeal.  Ortiz said he thinks God will use him in a big way.

His wife explained, “I have that sense this is about something bigger. This is something bigger than what has happened to us and to our family.”

Report from Compass Direct News

NEPAL: CHRISTIANS LITTLE CONSOLED BY ARREST IN CHURCH BOMBING

Militant group threatens more attacks unless non-Hindus leave country within month. 

KATHMANDU, Nepal, June 2 (Compass Direct News) – Vikash and Deepa Patrick had been married for nearly four months before the young couple living in Patna in eastern India managed to go on their honeymoon here. The decision to come to Nepal for four days of fun and sight-seeing would be a choice the groom will rue the rest of his life.

Vikash Patrick’s 19-year-old bride died while praying at the Assumption Church in Kathmandu valley’s Lalitpur district, the largest Catholic church in Nepal, in an anti-Christian bombing on May 23, the day they were to return home. Claiming responsibility for the violence was the Nepal Defense Army (NDA), a group wishing to restore Hinduism as the official religion of Nepal.

Patrick and two of his cousins also were injured in the explosion that ripped through the church, where nearly 400 people had turned up for a morning service.

A dazed Sun Bahadur Tamang, a 51-year-old Nepali Christian who had also gone to the church that day with his wife and daughter, pieced together the incident while awaiting treatment in a private hospital.

“We were in the prayer hall when a woman who looked to be in her 30s came and sat down next to my wife,” Tamang told Compass. “Then she got up and asked us where the toilet was. We said it was near the entrance, and she left, leaving her blue handbag behind. A little later, there was a stunning bang, and I fell on my daughter. People screamed, there was a stampede, and I couldn’t find my wife. I also realized I had lost my hearing.”

Deepa Patrick and a 15-year-old schoolgirl, Celeste Joseph, died in the explosion while 14 others, mostly women and teenagers, were injured. Another woman, Celeste’s mother Buddha Laxmi Joseph, died of a hemorrhage yesterday.

In the church hall, police found remains of the handbag as well as a pressure cooker. From 1996 to 2006, when Nepal’s underground Maoist party fought a guerrilla war against the state to overthrow monarchy and transform the world’s only Hindu kingdom into a secular republic, pressure cookers became deadly weapons in guerrilla hands. Packed with batteries, a detonator, explosives and iron nails, pressure cookers became lethal home-made bombs.

Also found scattered in the hall and outside the church were hundreds of green leaflets by an organization that until two years ago no one knew existed. Signed in the name of Ram Prasad Mainali, a 38-year-old Hindu extremist from eastern Nepal, the leaflets claimed the attack to be the handiwork of the NDA.

“A day after the explosion, a man called me up, saying he was the vice-president of the NDA,” said Bishop Narayan Sharma of the Protestant Believers’ Church in Nepal. “Though he was polite and expressed regret for the death of innocent people, he said his organization wanted the restoration of Hinduism as the state religion.”

Soon after the phone call, the NDA sent a fresh statement to Nepal’s media organizations with a distinctly militant tone. In the statement, the NDA gave “Nepal’s 1 million Christians a month’s time to stop their activities and leave the country” or else it would plant a million bombs in churches across the country.

“There is fear in the Christian community,” said Chirendra Satyal, spokesman for the Assumption Church. “Now we have police guarding our church, and its gates are closed. People coming in are asked to open their bags for security checks. It’s unheard of in the house of God.”

Suspect Arrested

An unexpected development occurred today as last rites were performed at the church on Joseph, the mother of the 15-year-old girl who also died in the explosion.

“At around 3 a.m. Tuesday, we arrested the woman who planted the bomb in the church,” Deputy Inspector-General of Police Kuber Rana told Compass.

Rana, who was part of a three-member police team formed to investigate the attack, identified the woman as a 27-year-old Nepalese, Sita Shrestha nee Thapa. Thapa allegedly confessed to police that she was a member of an obscure group, Hindu Rashtra Bachao Samiti (The Society to Save the Hindu Nation), and had planted the bomb inspired by the NDA.

The NDA made a small splash in 2007, a year after Nepal’s last king, Gyanendra Bir Bikram Shah, who had tried to seize absolute power with the help of the army, was forced to step down after nationwide protests. The cornered king had to reinstate a parliament that had been dissolved several years ago, and the resurrected house promptly decided to end his pretensions as the incarnation of a Hindu god by declaring Nepal to be a secular country.

Soon after that, a man walked into the office of a Nepalese weekly in Kathmandu and claimed to have formed the NDA, a group of former army soldiers, policemen and victims of the Maoists. Its aim was to build up an underground army that would wage a Hindu “jihad.” The man, who called himself Parivartan – meaning change – also claimed the NDA was nurturing suicide bombers.

According to police, Parivartan is the name assumed by a 38-year-old man from Morang district in eastern Nepal – Ram Prasad Mainali. The NDA began to acquire a reputation after it set off a bomb in 2007 at the Kathmandu office of the Maoists, who had laid down arms and returned to mainstream politics. In 2008, it stepped up its pro-Hindu war, bombing two mosques in southern Nepal and killing two Muslims at prayer.

It also targeted a church in the east, a newspaper office and the interim Parliament on the day the latter officially announced Nepal a secular republic.

Though police began a half-hearted hunt for Mainali, the NDA struck again last July, killing a 62-year-old Catholic priest, the Rev. John Prakash, who was also the principal of the Don Bosco School run in Sirsiya town in southern Nepal by the Salesian fathers.

“Extortion and intimidation are the two prime motives of the NDA,” said a Catholic church official who requested anonymity for security reasons. “Father Prakash had withdrawn a large sum of money to pay salaries as well as for some ongoing construction. Someone in the bank must have informed the NDA. It has good contacts, it knows who we are and our phone numbers.”

Small churches in southern and eastern Nepal, which are often congregations of 40-50 people who worship in rented rooms, have been terrified by threats and demands for money, said representatives of the Christian community. Some congregations have reportedly paid extortion sums to avert attacks from the NDA.

“Though the NDA does not seem to have a well chalked-out strategy, its activities indicate it receives support from militant Hindu outfits in India,” said Bishop Sharma of the Protestant Believers’ Church. “It has been mostly active in the south and east, in areas close to the Indian border. Bellicose Hindu groups from north India are likely to support their quest for a Hindu Nepal.”

While Thapa has been charged with murder, Rana said police are also hunting for NDA chief Mainali. And the arrest of Thapa has not lightened the gloom of the Christian community nor lessened its fears.

“There have been instances galore of police arresting innocent people and forcing them to confess,” said Bishop Sharma. “Look at the case of Manja Tamang.”

Tamang, a Believers’ Church pastor, was released this week after serving nine years in prison for murder that his co-religionists say he did not commit. Tamang staunchly protests his innocence with his church standing solidly behind him, saying he was framed.

Report from Compass Direct News

BANGLADESH: PASTOR’S WIFE GANG-RAPED, HOME ROBBED

Influential Muslim villagers, local media said to falsely blame Christians, Hindu.

VENNABARI, Bangladesh, January 20 (Compass Direct News) – The pastor of a Baptist church in this village about a 100 kilometers (62 miles) south of Dhaka said that earlier this month local Muslims tied him and his wife up, robbed his living quarters on the church property and gang-raped his wife.

The Rev. Shankar Hazra, 55, of Chaksing Baptist church in Gopalganj district, said that before leaving, the assailants desecrated the church building.

The night of the attack, the pastor said, he and his wife, 45, went out to a toilet outside their home at about 2 a.m. on Jan. 6.

“Suddenly a man loomed up from the darkness and thrust the snout of a homemade rifle at my chest and told me to keep mum, otherwise both of us would be killed,” Rev. Hazra told Compass. “Around seven to eight people swooped on us and tied me and my wife. They blindfolded my wife and took her inside the house.”

While Rev. Hazra was tied to a pillar on the porch of his house of corrugated tin and wood, the assailants took the keys of chests and trunks and looted valuables: gold and silver jewelry worth US$500, cash totaling US$300, a mobile phone, television, CD players, all their clothes except his cassock, and utensils.

“They even looted my daughters’ dresses,” Rev. Hazra told Compass. “After looting everything, they gang-raped my wife.”

The assailants also asked about the whereabouts of his two grown daughters, who had left the previous day after spending the Christmas and New Year holidays with their parents. Their daughters, ages 22 and 20, had returned to their studies in separate districts.

“If my daughters had been present in the house at that night, they would have been victims as their mother was,” Rev. Hazra said.

After the assailants left, Rev. Hazra managed to untie himself and found his wife lying unconscious on the bed, he said.

“My neighbors came and rushed her to a nearby hospital, and that hospital referred my wife to another big hospital in Gopalganj district because her condition was very serious,” he said.

The assailants also broke the door of the church building and urinated and defecated there, Rev. Hazra added.

 

Non-Muslims Blamed

Rev. Hazra and his wife said all of the assailants were Muslims, but that villagers tried to implicate non-Muslims and portray the attack as resulting from internal conflicts among Christians.

Police, influential villagers and local Muslim-owned media are trying to conceal likely anti-Christian motives for the crime, he said, by falsely accusing two Christians and a Hindu of participating – and labeling a local Baptist pastor as the “mastermind” of the attack. Police wrote the First Information Report (FIR) implicating the Christians and Hindu based on lies from villagers, and Rev. Hazra signed it without reading it due to his shaken state, he said.

Rev. Hazra’s wife, Depali Hazra, later filed an affidavit contesting the FIR in which the two Christians and one Hindu, along with a known criminal who is Muslim, were accused of the gang rape and theft. The Christians and Hindu were not involved in the rape and robbery, she reported in the affidavit.

“I was seriously ill after [the] gang rape, and my husband’s mind was unhinged at that time,” she reported. “Only [the] Muslim man Ilias Mridha and his yes-men did it. When I recuperated a little bit from illness, I came to know about the names of the Christians and Hindu in the case. Spontaneously and knowledgably I did this affidavit to get rid of those Christian and Hindu names from the case copy.”

Local police inspector Liakat Ali confirmed to Compass that non-Muslims had been implicated in the rape and theft charges filed at the police station. Other statements in the FIR – such as the number of assailants, four, rather than the seven or eight cited by the pastor – are at odds with Rev. Hazra’s account, further indicating that police relied on second-hand information from villagers rather than the experience related by the victims.

“We have arrested three people so far in connection with gang rape and looting out of four people mentioned in the FIR by Hazra,” said Ali. “Among those mentioned, two people are Christians, one Hindu and one Muslim. According to the case information, the mastermind of the incident is Monotosh Banarjy, a pastor of a Baptist church, who might not have been present at that time.”

There is no criminal record against the Christian arrested, Sushil Baroi, a Catholic, he said.

“But the arrested Muslim man, Ilias Mridha, is a criminal who had been arrested several times before,” said Ali.

Local Christians said Mridha, 38, who has been jailed several times, commits crimes under the direction of local influential persons.

Father Jacob Gobbi, head priest at Baniarchar Catholic Church, told Compass that Baroi was not involved in the gang rape and robbery.

“He is innocent, and we want that he should be released as soon as possible,” Fr. Gobbi said.

Rev. Hazra said he and his wife are living temporarily with her relatives as protection from further attacks at their church quarters.  

Report from Compass Direct News