Agency says risk of catching virus through touch is 1 in 10,000, but continues to recommend hand-washing and disinfecting areas where COVID cases were present

US public health agency guidelines say classroom schooling can resume safely with masks, social distancing and vaccination of teachers provides 'additional layer of protection'

US president-elect calls on Americans to wear masks, pledges to reopen most of nation's schools after entering White House, as raging pandemic kills over 2,000 a day

Rochelle Walensky is head of infectious diseases at Massachusetts General Hospital; US president-elect to nominate California attorney general Xavier Becerra as secretary of health