On the back of preliminary studies linking lower rates of COVID-19 to BCG usage, scientists are plannning trials in healthcare workers.
The respiratory disease can be deadly if left untreated.
Nearly 100 million children are infected with tuberculosis, which causes 2 million deaths each year.
A new report found TB incidence to be higher in some London boroughs than developing countries.
Health officials are tracking down airplane passengers who may have had direct contact with the woman.
Health workers have confirmed one case of tuberculosis among those who tested positive for infection.