London, Jul 19 (PTI) The level of antibodies remains high nine months after infection with SARS-COV-2, a virus that causes Covid-19, both symptoms or asymptomatic, according to a study published on Monday that analyzes data from all cities from all over the city City.
Researchers from Padua University in Italy and Imperial College London in the UK tested more than 85 percent of the 3,000 residents of VO ‘, Italy, in February and March last year for infection with SARS-COV-2, a virus that caused Covid -19.
They then tested it again in May and November 2020 for antibodies to viruses.
This study, published in the journal Nature Communications, found that 98.8 percent of infected people in February and March showed the level of antibodies detected in November.
The results also show that there is no difference between people who suffer from the symptoms of Covid-19 and those who are free of symptoms.
“We did not find evidence that the level of antibodies between symptomatic and asymptomatic infections differed significantly, indicating that the power of the immune response did not depend on the symptoms and severity of the infection,” said the leadership of Ilaria Dorigatti’s research leader, from Imperial College.
“However, our research shows that the level of antibodies varies, sometimes in real terms, depending on the test used,” Dorigatti said.
The level of antibodies is tracked using three ‘tests’ – tests that detect various types of antibodies that respond to various types of viruses.
The results showed that while all types of antibodies showed several decreases between May and November, different decay rate depending on testing.
The team also found cases of increased antibody levels in some people, suggesting the potential for re-infection with the virus, provided the urge for the immune system.
These findings indicate that caution is needed when comparing the estimation of infection rates in the population obtained in different parts of the world with different tests and at different times.
“May testing shows that 3.5 percent of the VO population has been exposed to viruses, although not all these subjects realize their exposure remembers most asymptomatic infections,” said Professor Enrico Lavezzo, from Padua University.
“However, at follow-up, what was done about nine months after the plague, we found that antibodies were less abundant, so we needed to continue to monitor the persistence of antibodies for a longer period of time,” Lavezzo said.
The researchers also analyzed the status of household member infections, to estimate how the possibility of infected members would continue infection in the household.
They found that there was a possibility of about one of four infected with SARS-COV-2 passed infection to family members and that most transmissions (79 percent) were caused by 20 percent of infections.
This finding confirms that the majority of infections do not produce further infection and a small portion of e infection causes a large number of infections, the researchers said.
The big difference in how an infected person can infect other people in the population show that behavioral factors are the key to epidemic control, they said.
Physical distance, and limit the number of contacts and masks that are wearing, it is important to reduce the risk of transmitting the disease, even in a highly vaccinated population, according to research.
DataSet, which includes the results of two mass PCR testing campaigns conducted in February and March, and antibody surveys, also allow them to separate the impact of various control steps.
This study shows that, in the absence of case insulation and short locking, the manual contact search will not be enough to suppress the epidemic.