https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2769442 https://jamanetwork.com/journals/jamainternalmedicine/fullar... Summary: "investigato

https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2769442 https://jamanetwork.com/journals/jamainternalmedicine/fullar... Summary: "investigators found that the prevalence of COVID-19 antibodies among hospital employees was lower than what had been reported for the surrounding general community that is consistent with personal protective equipment being effective at preventing exposure of hospital workers. In addition, researchers found via laboratory testing that N95 masks with intact elastic straps or if sterilized maintained their effectiveness even if they had passed their expiration point, offering alternatives to the scarcity of N95 masks." Conclusion: "PPE, when available and properly used, confers protection and lower infection rates of COVID-19 among health care workers when compared with reported infection rates in the general public."