Infectiousness peaks early in Covid-19 patients, study suggests
Nov 22 2020
Researchers involved in the study examined 817 patients 65 or older admitted to the ED and who were diagnosed with COVID-19.
Like COVID-19, SARS is also caused by another coronavirus.
PEOPLE INFECTED WITH the coronavirus could remain immune for years after their recovery, a new study suggests, offering news that could quell worries about waning immunity as potential vaccines are nearing availability.
Officials in Beijing are pushing a new study that suggests that the contagion may have been spreading in the European nation as early as September - three months before it was confirmed to be spreading in the long-assumed epicenter in the Chinese city of Wuhan, The Times of London noted.
"Although viral RNA loads appear to be very similar between those with and those without symptoms, a few studies suggest that asymptomatic individuals may clear viral material from their bodies more quickly". Cases represented a range of asymptomatic, mild, moderate, and severe COVID-19 cases, including 41 cases at over 6 months post-infection. How many of them are there, can they transmit the virus like active COVID-19 patients or not?
Researchers said the results are only relevant for the period of self-isolation for people with confirmed Covid-19, and do not apply to people simply quarantining after contact with someone infected.
Conducted in collaboration with Oxford University Hospitals, this large-scale research on immunity to Covid-19 has not yet been independently reviewed.
Russian Federation last week said its first vaccine against COVID-19, Sputnik V, was 92% effective, according to interim trial results.
Four produce the symptoms of the common cold and immunity is short-lived.
"Frailty is increasingly understood to affect older adults' responses to vaccines", the editorialists write.
T cells come in two forms: one that group that works alongside B cells to manufacture the right antibodies to fight a given pathogen and a second type that acts like an assassin, killing off once-healthy cells that have become infected, so that they can't help a virus, bacterium or even cancer spread elsewhere.
Furthermore, it reorganises the "cytoskeleton", which gives cells their shape and "serves like a railway system to allow the transport of various cargos inside the cell", coauthor Dr. Ralf Bartenschlager of the University of Heidelberg, Germany, told Reuters.
They believe that if the chicken antibodies are integrated into a nasal spray or droplets, they could provide short-term protection from Covid-19. In this Perspective, Annika Karlsson and colleagues discuss unresolved questions surrounding T cell immunity against SARS-CoV-2 infection, including one that's important to consider for development of T cell-targeted vaccines: are T cells critical to generate durable immunity to the virus?