Conducted in Springfield, Missouri, a real world experience presented an opportunity to assess whether masks successfully prevented the spread of COVID-19 from two hairstylists to 139 of their clients. Both the hairstylist and the person receiving a haircut wore masks or face coverings during the appointments. Each stylist wore double-layered cotton face masks. The hairstylists were both symptomatic while seeing these 139 clients (mean age of 52 years and all willingly seeing the stylist without knowing their COVID-19 status). Despite having some typical, yet mild, respiratory symptoms, like cough and congestion, neither hair stylist had been tested for coronavirus when they saw these particular clients. Haircut appointments lasted for an average of 19 minutes.
Once the hairstylists learned that they tested positive for COVID-19 (after 8 days of symptoms for one of the stylists, and 5 days of symptoms for the other), they stopped seeing clients and self-quarantined. The Greene County Health Department in Missouri contact-traced all 139 clients that were exposed to the stylists, recommended they quarantine for 14 days, and offered free testing to all. Of the nearly 50% who agreed to receive a nasopharyngeal swab test, all of them tested negative for COVID-19.
There were also no respiratory symptoms reported by any of the 139 clients, or their secondary groups, such as family and friends following exposure to the hairstylists. The county health department was able to interview 104 of the identified clients, which allowed for supplementary data to be acquired too, such as age, duration of appointment, and type of face covering used. The only people identified who developed COVID-19 symptoms and/or tested positive for the virus were the immediate housemates of one of the hairstylists.
Through the use of face coverings, two stylists who were both symptomatic and COVID-19 positive did not transfer the virus to their clients during their respective appointments.
This study bolsters other scientific evidence corroborating the use of face coverings, whether homemade or surgical, in slowing the spread of COVID-19. It is remarkable, and reassuring, that the use of simple face coverings prevented the transmission of the COVID-19 virus from two symptomatic hair stylists to their clients in close proximity.