Beijing, July 12 (Xinhua): In the absence of specific omicrona vaccines, which extends the vaccination period between the doses can contribute to stop the rapid appearance of this Covid mutation -19, said a new study.

Published in the New England Journal of Medicine earlier this month, the study was directed by Gao Fu, an academic from the Academy of Sciences of China (CAS) (CAS) and head of the Chinese center for disease control and prevention.

Researchers in the study evaluated the levels of neutralization against the original subvariants and omicrons SARS-COV-2 including BA.4 and BA.5 in blood samples obtained Of the vaccine makers, who had received three doses of inactivated vaccines made by China, vaccine from their ZF2001 protein subunit, or two doses of inactivated vaccines driven by ZF2001.

The results showed that in each group of vaccines, the neutralizing antibody is vels against all the subvariants tested omicrons were significantly lower than the levels against the original strain of the Virus, indicating that these subvariants have the ability to evade immune protection.

ZF2001, researchers found that neutralizing antibodies levels increased with the growing interval between the second and third dose, especially against the subvariants of omicrons.

For vaccine makers who had an interval of intervals of four to six months between the second and third dose, their neutralizing antibody levels were higher in almost almost a factor of 10 against the original variant and for a factor of approximately 30 against all the Omicron subvariants, compared to those who had 1 month interval between dose.

The researchers explained that the best performance of the ZF2001 was due to its use of a mastery of union to the receiver as an antigen, which could induce higher levels of levels of levels of level levels NEU TRUZING ANTIBODS AGAINST OMICRONES SUBVARIATES THROUGH THE MultiplE REINFORCEMENT DOSE ADMINISTRATION.

The Institute of Microbiology of Cas and Anhui Zhifei Longcom Biopharmaceutical jointly developed. China granted market approval to the vaccine in March.

The subvarious Omicron Ba.5 is becoming the dominant strain of COVID-19 worldwide and is causing cluster infections in China. The regions, including Beijing, Tianjin and Shaanxi, have recently informed the local Covid-19 cases of the Omicron subvariant that arrives from abroad.

According to the study, for better immune protection of current and possible future epidemic subvariants, the development of updated vaccines is still needed as reinforcements. ENITEM



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