A summary of some recent studies on Covid-19, including research that warrants further study to corroborate findings yet to be certified by peer review.
A study of healthcare workers in the pre-Omicron era estimated that a prior SARS-CoV-2 infection afforded 85% protection against a second infection over six months, the researchers said, while “the protection against reinfection by Omicron afforded by past infection may be as low as 19%”.Sperm quality is impaired for months for some people after recovery from Covid-19, researchers have found.
Among 51 men tested between one and two months after recovery, 37% had reduced sperm motility and 29% had low sperm counts. Among 34 men who provided semen samples at least two months after recovery, sperm motility was impaired in 28% and sperm counts were low in 6%.“Couples with a desire for pregnancy should be warned that sperm quality after Covid-19 infection can be suboptimal,” the researchers concluded.
The molecule belongs to a class of compounds known as aptamers. Because they are made from RNA or DNA, aptamers are easier to synthesise than protein-based antibodies that can only be produced in living cells, said Julian Valero, of Aarhus University in Denmark.
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