Scientists have yet to agree on whether this is a cause for alarm yet.
A childhood vaccine may help prevent severe Covid-19 infections, while cigarette smoke increases the risk of contracting the virus, according to the latest study.
Hopes grow of a potential vaccine for the novel coronavirus after two trials, each by British and Chinese researchers, showed most volunteers had developed widespread antibody immune response.
Coronavirus has infected more than 13.6 million people, of whom over 7.8 million have recovered and some 584,000 have died. Here are the updates for July 15:
US physician Anthony Fauci says he was optimistic the world would soon have a vaccine that would end the coronavirus pandemic.
The concept of “immunity passports” or “risk-free certificates” has been floated as a way of allowing people protected against reinfection to return to work.
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