Jul 3, 2020

Know your mask: flu respirator masks vs surgical face masks

public health
Tom Bracewell
4 min
Chief Medical Officer for Clinova, Dr Tom Bracewell, provides clarification on the different types of face masks in the wake of the COVID-19 pandemic
Chief Medical Officer for Clinova, Dr Tom Bracewell, provides clarification on the different types of face masks in the wake of the COVID-19 pandemic...

In only a few months, the world as we know it has changed fundamentally. Many countries are still under some version of lockdown and widespread travel restrictions remain in place. As more members of the public suddenly seem to be claiming expert epidemiologist knowledge, often sharing misleading ‘facts’, people have a greater need than ever for clear, reliable information. The rise of fake news and misinformation can now seem painfully intertwined with the spread of the coronavirus. 

Social distancing is of course essential, but it’s important to bear in mind that virus-filled droplets generated by coughing and sneezing can travel up to eight metres, as found by a ‘Journal of the American Medical Association’ article based on work from MIT Associate Professor Lydia Bourouiba. Sneezing produces a ‘muzzle velocity’ of 50 metres per second (m/s), with 10 m/s for coughing. This may render the two-metre distance somewhat unhelpful unless reinforced by an additional barrier: a mask. 

The British government has made face coverings compulsory on public transport, such as buses, trams and trains. While it has not mandated protection standards, The World Health Organization, along with multiple independent researchers, recommends that in enclosed spaces, people over 60 ̶ and people of any age with underlying health conditions ̶ should wear a ‘medical grade’ mask. Researchers at the University of East Anglia found that ‘wearing a face-mask while out and about on public transport, in shops and crowded places could help protect vulnerable people from COVID-19’.

The basic science of how viruses spread and how masks work makes it clear that any kind of barrier is an improvement on none. However, not all masks are created equally. 

Currently, there are two main types of face masks: surgical face masks (also known as simple face masks) and respirator masks (such as N95 respirator and other FFP2/3 forms). Unlike surgical masks, which are unable to filter out virus-containing droplets, respirator masks protect against small droplets and particles including aqueous and oily aerosols, smoke, and fine dust. For this reason, respirator masks are an important tool for use during the COVID-19 pandemic.

A study published by the UK’s Health and Safety Executive, ‘Evaluating the protection afforded by surgical masks against influenza bioaerosols’, found that respirators provided a much higher level of protection against viruses. The study focused on the effectiveness of surgical masks against a range of airborne particles and through separate tests measuring ‘levels of inert particles and live aerosolised influenza virus’.

The results showed that, when compared to the baseline level, surgical masks produced a 6-fold reduction in exposure, meaning that live virus cells could be detected in the air behind all models of mask tested. In comparison, a well-fitted respirator provided a 100-fold reduction as a minimum, providing meaningful protection from virus particles.

Another recent study conducted by engineers at the University of Edinburgh assessed different face coverings using the Background Oriented Schlieren imaging technique that enables scientists to measure the distance and direction travelled by air expelled when a person breathes or coughs.

Measurements were taken from people wearing different face coverings while standing or lying down, and from a manikin connected to a cough-simulating machine. Researchers found that all face coverings without an outlet valve reduce the forward distance travelled by a deep out-breath by at least 90 per cent. Additionally, only masks that form a tight seal with the face were found to prevent the escape of virus-laden fluid particles, the team says.

While masks do not guarantee 100% protection for the wearer, if used correctly, they can considerably reduce the likelihood of infection. 

With public demand for masks growing daily, it seems sensible to ensure that those in higher-risk groups and higher-risk situations are able to access these high-specification masks. Masks, when added into the mix of social distancing and hand washing, can contribute to a meaningful ‘flattening of the curve’. While this term may at first seem only of interest to statisticians, it matters to us all as it is the concept used by virologists to indicate the reduction in rates of virus transmission. When an infected person coughs or sneezes, up to half a million virus particles can spread to those around them, so it’s never been more important to have the right protection against what is a very infectious virus. 

Following this evidence, Clinova has seen a significant increase in enquiries from the public about its face mask, COVAFLU ™ Respirator Mask. The most common question relates to the suitability and effectiveness of different mask types during the COVID-19 pandemic.

The protective function of the respiratory masks is verified by the Europe-wide EN 149 standard. There are two classifications of respirator masks ̶ FFP2 and FFP3 ̶ which filter up to 94% and 99% of particles respectively. The more particles that need to be filtered, the greater the number of filter material layers. The different layers fulfil a variety of functions including aesthetics, comfort, stability, tear-resistance and of course, filtering.

Ultimately, while surgical masks can help prevent transmission of infectious agents by large droplets, they do not protect against airborne infectious agents in smaller droplets, such as viruses. As such, surgical masks will be less effective at protecting the wearer from potential infection by COVID-19.

By Dr Tom Bracewell, Chief Medical Officer for Clinova 

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Jun 14, 2021

Zoom enters the healthcare market - a timeline

3 min
We chart Zoom's rise and entrance into the healthcare market

Since the pandemic began Zoom has become an integral part of daily life for people working from home, as well as a vital tool for families and friends to communicate. However it's also been eyeing up the healthcare space since 2017, and following the boom in telehealth the company has been rolling out additional services. Here we chart Zoom's move into healthcare. 

2011 - 2013

Zoom is founded in San Jose, California, by Eric Yuan, formerly of Cisco. He got the idea to create a video calling platform from his visits to his girlfriend while he was a student, which would take 10 hours by train. 

A beta version is released in 2012, which can host up to 15 participants. In 2013 this rises to 25. By mid-2013, Zoom has 1 million users. 

2014 - 2017

Zoom attracts investors, including Sequoia Capital, Emergence and Horizon Ventures. By January 2017, Zoom has a series D funding worth $100 million.

2017 - 2019

Zoom for Telehealth launches, including an integration with EHR system Epic. It has cloud-based video, audio, and content sharing features, a "waiting room" for patients, and can easily be integrated into healthcare provider's workflows. 

In 2019 Zoom goes public, with its IPO rising 72% in one day. 


As a result of the pandemic, Zoom gains 2.2 million new users, more than in the whole of 2019. On the 23rd of March alone - the day the UK lockdown was announced - the platform was downloaded 2.13 million times around the world. 

Share prices rise to around $150, and founder and chief executive Eric Yuan becomes one of the world's richest people, with an estimated net worth of $7.9 billion. 

Early security issues are addressed by encrypting data with the Advanced Encryption Standard (AES). By now the the platform allows 99 people to be on a call simultaneously
New features launch, including Zoom Home and Zoom for Chats. Throughout the year the platform is used to replace most kinds of real life events: work meetings, online classrooms, church services and social events. 


Renamed Zoom for Healthcare, users can share secured video, audio, and content through desktops, mobile phones, and conference devices. As well as Epic, it can be integrated with Strmr, IntakeQ, and Practice Better.

It can also be used with diagnostic cameras and other point-of-care devices, including digital stethoscopes.

In an interview with Korea Biomedical Review, Zoom Global Healthcare Lead Ron Emerson said: "Our service is not simply a virtual care and telemedicine platform but a multi-purpose platform that can satisfy the needs of healthcare institutions."

"It can be used for administrative tasks, including telemedicine, medical team meetings, recruitment, medical education, employee training, and disease prevention. Analysing electronic records managed by Zoom could provide meaningful insights into patient care." 

Phoenix Children's Hospital, Belfast's Hospital Services Limited, Butler Health Services and the global Project ECHO are among Zoom for Healthcare's current customers. 

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