Coronavirus

Unexpected vaccine hesitancy and other obstacles have frustrated India’s massive immunization challenge

New device looks for signature mix of volatile compounds in patients' exhaled air

Most countries sequence less than 1% of virus samples

The Serum Institute of India has an outsize—and troubled—role in providing COVID-19 vaccines at home and abroad

Regulatory hurdles and glacial immunization campaign leave the country unprotected

As U.S. pandemic subsides, societies are exploring their options

Report proposes major overhaul of health systems to fight future threats

After being challenged, research team provides more data to back its controversial hypothesis but the relevance to human health is unclear

Open letter asks for better access to genomic and epidemiological databases

Worries about AstraZeneca and Johnson & Johnson vaccines may slow plan to immunize the world

In 2020, the country had relatively few coronavirus deaths. Scientists need more information to figure whether this was real or a mirage

Agency declines import permit, claiming crippled adenovirus that serves as vaccine is active in second doses

Critics question protocols and ethics of parties, concerts, and sports events that rely on testing to keep people safe

Organ transplant recipients appear less protected, but people with autoimmune disease and cancer can have a strong immune response

Disentangling the roots of survivors’ cognitive deficits is no easy task

Letters to parents and staff echo unsupported claims that vaccinated people may be “transmitting something” to others that cause health problems