What we know about COVID-19 is constantly evolving. Researchers across the world are studying the virus.A study published in The Lancet revealed that the strain of COVID19 can stay on clothes for a day and on stainless steel and plastic for four days.
This also gives rise to the risk of coming in contact with the virus during essential trips outside.
Coronavirus on human hair
Honestly, there has not been a single study yet to establish the link between coronavirus on hair. So, it is not clear for how long the virus can stay or survive on your hair or beard. However, there is a possibility that it can stay for a few days or at least some hours. This does not mean you should start washing your hair every time you return from an outside trip. Doing this would be impractical and may harm your hair health.
The bottom line
Your hair is, in general, safe and cannot cause infection, provided you follow social distancing norms and not stroke it with contaminated hands. If someone sneezes at the back of your head, then it is best to take a bath and clean your hair properly.