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Researchers from the University of Padua and Imperial College London conducted SARS-CoV-treatment on more than 85% of the 3000 residents of Vo', Italy in February/March 2020.
The team found that 98.
Antibody levels are tracked through three "tests"-different types of antibodies that respond to different parts of the virus
The research team also found that some people's antibody levels are rising, which means they may be infected with the virus again, thereby strengthening the immune system
Lead author Dr.
"However, our research does show that depending on the test used, there are differences in antibody levels, sometimes significant
Professor Enrico Lavezzo of the University of Padua said: "Tests in May showed that 3.
"However, in the follow-up about 9 months after the outbreak, we found that the number of antibodies was small, so we need to continue to monitor the persistence of antibodies for a longer period of time
The team also investigated the infection status of family members to estimate the possibility of infected members spreading the infection within the family
This finding confirms that there is a big difference in the number of secondary cases from infected persons, most infections will not produce further infections, and a few infections will produce a large number of infections
The huge difference in the degree of infection transmission indicates that the control of crowd behavior is the key control factor to reduce transmission, such as physical distance, and limiting the number of contacts and wearing masks
The team’s data set includes the results of two large-scale PCR testing activities conducted in February and March 2020, as well as the results of antibody surveys conducted in May and November, which also enabled them to sort out the impact of various control measures.
They show that in the absence of case isolation and short-term lockdown, manual contact tracing alone is not enough to contain the epidemic
Professor Andrea Crisanti, the project leader from the Department of Life Sciences at Imperial College London and the Department of Molecular Medicine at the University of Padua, said: “Our research also shows that if large-scale screening is not carried out, contacts are manually traced-that is, if there are known and Finding positive individuals on the basis of announced contacts-has limited impact on the containment of the epidemic
Dr.
Journal Reference:
Ilaria Dorigatti, Enrico Lavezzo, Laura Manuto, Constanze Ciavarella, Monia Pacenti, Caterina Boldrin, Margherita Cattai, Francesca Saluzzo, Elisa Franchin, Claudia Del Vecchio, Federico Caldart, Gioele Castelli, Michele Nicoletti, Eleonora Nivlaador, Ludovician Fava, Simone Guglielmo, Mariateresa Fascina, Marco Grazioli, Gualtiero Alvisi, Maria Cristina Vanuzzo, Tiziano Zupo, Reginetta Calandrin, Vittoria Lisi, Lucia Rossi, Ignazio Castagliuolo, Stefano Merigliano, H.