A 2013 Study in the BMC of Public Health on Cough Etiquette showed air is expelled from the chest at a rate of up to 100km/h. Cough into the hand, elbow or mask does not block all bacteria from entering the environment.(1)

• The Centers for Disease Control and Prevention describes social distancing as "remaining out of congregate settings, avoiding mass gatherings and maintaining distance (approximately 6 feet or 2 meters) from others when possible."
• The measurement of 6 feet or 2 meters comes from studies showing the largest droplets from a sneeze fall within 2 meters. (2)
• Smaller droplets travel further if suspended into the air. If they come contact with a physical barrier, whether it be a shirt-sleeve or clear protector they may not be able to continue travelling up to 6 additional meters.
• “Social Distancing” or now “Physical Distancing” is often not possible for Front Line Workers.
• While physical barriers cannot block all the risk of viral spread, they significantly reduce the risk of droplet transfer via a sneeze or cough.
• The barrier also prevents the customer from coming into the employees “comfort zone” and helps to respect the physical distance during the business interaction. It also prevents the customer from mistakenly touching employee items like stationery and pens.
• The barrier shows the customer and employee risk is being mitigated. Keep your employees at work and your business running.
• When someone coughs or sneezes, small drops of liquid spray from their nose or mouth. If you're standing too close, you can breathe in the droplets, which may contain the coronavirus if the person coughing is infected, according to the World Health Organization.
• What height should I have my barriers – Approximately 90% of Men are 72 inches or less.

Sobeys Is Installing Thousands of Plexi-Glass Barriers at Checkouts

www.theglobeandmail.com/business/article-sobeys-to-install-plexiglass-barriers-at-checkouts-as-grocers-work-to/

Publix will install plexiglass to protect cashiers from COVID-19

https://www.wtsp.com/article/news/health/coronavirus/publix-coronavirus-barrier-partition/67-af6a9127-325d-4645-af63-e84f31a68452

Reference 1: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3846148/

Reference 2: https://www.ncbi.nlm.nih.gov/pubmed/17542834