In the fight against the coronavirus, antibodies are less effective against the heavily mutated Omicron variant but thankfully the immune system can also call upon neutrophils, B and T cells to fight the virus
Winter is coming to the northern hemisphere, and with it the flu season -- however advances spurred by the fight against Covid-19 are boosting hopes of finding a more reliable vaccine
Overshadowed by the global push for vaccines, the search for treatments for Covid-19 has made steady progress. This is what works, what might work, and what definitely isn't helpful
How effective are Covid vaccines if your immune system is compromised by HIV, cancer or a recent organ transplant?
Five or six doses? Pfizer says each vial of its Covid-19 vaccine contains six doses but the difficulty in obtaining that extra dose means many countries are facing a drop in supply
Despite dozens of deaths of people shortly after they were vaccinated against coronavirus, scientists say the evidence available so far does not incriminate the new anti-Covid vaccines