According to Dr Zev Zelenko, yes...quercetin may be a good preventative, for China Flu.
I am 81 years old, very seldom wear a mask, and take quercetin, zinc, and vitamin c daily. So far no china flu and until a vaccine for china flu is available will not change my daily routine.
Have been taking zinc plus quercetin since Dr Zlev said it’s a good OTC for Hydroxychloroquine and zinc and my brother who
is a GP confirmed and we are also giving to my 93 year old dad per his advice. Glad to hear this!!!