Study followed 5,000 medical personnel who were under observation after getting first two shots

Meanwhile, country to widely administer synthetic antibody treatment to COVID-19 patients, prioritizing the unvaccinated

Age also a major factor in immune response, according to study, which could lead to targeted treatment based on biological sex

British pharmaceutical giant, whose coronavirus vaccine faces European safety doubts, announces it will provide 700,000 doses of a potential treatment for virus

In early 2020, donors recruited by the Covid Plasma Initiative supplied 50% of the nation's plasma, also demonstrating the treatment's efficacy and paving the way to widespread use

US government health bodies warn there's not nearly enough data to prove efficacy, but doctors report no deaths among thousands of high-risk patients prescribed the new treatment

Infectious disease chief advising Health Ministry warns against using serology tests in rollout of 'green passport,' since body fights reinfection even after antibodies fade

Research by UN and Switzerland shows that even though the level of antibodies fade, body maintains sufficient memory B cells, and they manage to stave off reinfection

Antibody treatment could be used to reduce deaths in nursing homes if immediately deployed upon discovery of infection; 10 people injected so far upon exposure to pathogen

One paper shows body retains high level of memory B cells for lengthy period; two others examining statistics indicate reinfection chances very low for at least half a year