The coronavirus pandemic is still ongoing, although vaccination around the world is gaining momentum. However, the number of vaccines in the world is still not enough to inoculate everyone. The situation with coronavirus in Ukraine remains stable, but the number of deaths due to the disease has already exceeded 50,000.
The worst situation is now in India, despite the fact that the country is producing a vaccine against the coronavirus, the number of deaths reaches 30,000 daily. Countries are massively sending humanitarian aid to India. 
has compiled the most interesting news about the fight against coronavirus in the world.
Immunity to coronavirus can last for a year
New studies on immunity to coronavirus have shown that the body can produce antibodies for a year after an illness.
Taken together, the studies show that most people who have recovered from COVID-19 and who were later vaccinated do not need additional doses of the coronavirus vaccine. However, additional vaccination is needed by already vaccinated people who have not yet had coronavirus, and those who have not developed a stable immune response.
At the same time, according to research, the cells that keep memory of the virus remain in the bone marrow and can produce antibodies when needed.
Another study identified that so-called memory B cells continue to mature and strengthen for at least 12 months after the initial infection with the coronavirus.
Scientists have found a connection between AstraZeneca and Johnson & Johnson vaccines
Researchers from the Goethe University in Frankfurt stated they had identified the cause of blood clots after vaccination with AstraZeneca and Johnson & Johnson.
According to Professor Rolf Marschalek, who leads a group of scientists involved in the problem research, the nascency of blood clots is related to adenovirus vectors. It is their two vaccines that are used to deliver the coronavirus adhesive protein to the human body.
According to scientists, the adhesive protein is directed not into the cytosolic fluid of a healthy cell (this is where the coronavirus usually produces proteins), but into the nucleus. After that, parts of the adhesive protein are cleaved and create mutations that cannot bind to the cell membrane and induce immunity. Instead, mutated versions of the protein cause blood clot formation in about one in 100,000 people.
Politicization of the coronavirus origin
The United States has reopened its investigation into the coronavirus origin. At the same time, the Chinese authorities reacted to this with calls to stop politicizing the origin and spread of the coronavirus around the world.
According to the Chinese authorities, such an approach could seriously impair international cooperation in the fight against the pandemic.
China noted that it supports a comprehensive study of all early cases of COVID-19, as well as the investigation into the activities of some secret bases and biological laboratories around the world.
Such calls emerged after US President Joe Biden had instructed US intelligence to redouble efforts to find the source of the coronavirus origin.
New Brazilian coronavirus strain
A new coronavirus strain has been discovered in Brazil, but its origin is not yet clear. A new virus type has been recorded in the city of Itirapina in the state of São Paulo. Also, the new strain has spread to the city of Porto Ferreira.
It is not yet known whether the new strain is more contagious and dangerous than the original virus. The strain was named P.4. According to scientists, it is a relative of the P.1 strain that was found in the city of Manaus.
In addition, the P.1 strain can overcome immunity in those who have already had coronavirus. It is also 1.4-2.2 times more contagious than other strains. And the likelihood of death after infection with this type increases by 10-80%.
HIV medication can help fight coronavirus
Brazilian scientists from the University of Brazil conducted research on medications used to treat HIV. For instance, a drug called atazanavir can reduce viral load in people with coronavirus.
In addition, the researchers hope that such treatment can accelerate the recovery of coronavirus patients.
Also, the medication can reduce the number of hospitalizations for people with severe coronavirus. However, more research is needed to confirm the drug's efficacy.
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