Antibodies triggered by Sinovac Biotech's Covid-19 vaccine decline below a key threshold from around six months after a second dose for most recipients, although a third shot could have a strong boosting effect, according to a lab study.

At least 123 people with dengue fever have been admitted to hospitals in the country during 24 hours till 8 am today, which is the single-day highest of this year.

The chief executive of the tobacco business Philip Morris International (PMI) has called on the UK government to ban cigarettes within a decade, in a move that would outlaw its own Marlboro brand.

A mixed vaccination of first AstraZeneca (AZN.L) and then a Pfizer (PFE.N) COVID-19 shot boosted neutralizing antibody levels by six times compared with two AstraZeneca doses, a study from South Korea showed.

Seventeen people died while being treated at the Covid units of hospitals in Bogura till 8am today.

An unvaccinated snow leopard at the San Diego Zoo has contracted Covid-19.

Two people died of Covid-19 and 10 with Covid-like symptoms in the Barishal division in 24 hours (till 8 am today).

Eight people died of Covid-19 and 18 with Covid-like symptoms at the Covid-19 units of three Bogura hospitals in 24 hours (till 8 am) today. This is the highest number of single-day Covid-19 related deaths in Bogura.

A longer gap between doses of Pfizer's Covid-19 vaccine leads to higher overall antibody levels than a shorter gap, a British study found on Friday, but there is a sharp drop in antibody levels after the first dose.

Two doses of Pfizer or AstraZeneca's Covid-19 vaccine are nearly as effective against the highly transmissible Delta coronavirus variant as they are against the previously dominant Alpha variant, a study published on Wednesday showed.

The Tokyo Olympics should not be judged by the tally of Covid-19 cases that arise because eliminating risk is impossible, the head of the World Health Organization told sports officials as events began in Japan.

At least 13 people with dengue fever were admitted to hospitals in the country in 24 hours, till 8am today.

Two-thirds of India’s population have antibodies against the coronavirus, according to data released from a survey of 29,000 people across the nation conducted in June and July.

Britain's Chief Scientific Adviser Patrick Vallance said that 60% of people being admitted to hospital with Covid-19 are unvaccinated, correcting an earlier statement he made on Monday.

Prime Minister Boris Johnson's 'freedom day' ending over a year of COVID-19 lockdown restrictions in England was marred on Monday by surging infections, warnings of supermarket shortages and his own forced self-isolation.

Facebook on Saturday defended itself against U.S. President Joe Biden's assertion that the social media platform is "killing people" by allowing misinformation about coronavirus vaccines to proliferate, saying the facts tell a different story.

Austria and the US said on Saturday they were investigating reports of US diplomats and other officials in Vienna falling sick with health problems similar to the so-called “Havana syndrome”.

British health minister Sajid Javid on Saturday said he had tested positive for Covid-19, but added that his symptoms were mild and he was thankful to have had had two doses of vaccine against the disease.

France will allow international travelers who have had AstraZeneca’s Indian-manufactured vaccine into the country starting Sunday.

The number of people being diagnosed with dengue fever across the country this year crossed the 1,000 mark with at least 63 more being admitted to hospitals in the 24 hours till 8:00am today.