This Monday, the 27th, the application of the bivalent vaccine against Covid-19 began. It is a vaccine that protects against two specific strains of a virus or bacterium. According to the Ministry of Health, this new version improves immunity against the original strain virus and also against the Omicron variant. Therefore, it now has a safety and efficacy profile similar to that of monovalent vaccines.
bivalent vaccine
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As mentioned earlier, it protects against two strains of a virus or bacteria. For example, a bivalent human papillomavirus (HPV) vaccine protects against two strains of the HPV virus that are known to cause cervical and other cancers.
Juarez Cunha, director of the Brazilian Society of Immunizations, explains how it works in practice.
′′ The monovalent vaccine, as the name itself says, has a single type of virus that causes Covid. It was originally designed with that so-called ancient virus, the first one that appeared in China at the end of 2019, so all the vaccines that we had and used so far were monovalent, regardless of the manufacturing laboratory”, he said.
Initially, the vaccine will be applied to risk groups. Immunization will be done as follows:
- Phase 1: people over 70 years old, immunocompromised, indigenous, riverside and quilombola;
- Phase 2: people aged between 60 and 69 years;
- Phase 3: pregnant and postpartum women;
- Phase 4: health professionals.
The two bivalent vaccines that will be applied in Brazil were produced by the Pfizer laboratory.
They received authorization from the National Health Surveillance Agency (Anvisa) for emergency use and are indicated as a single booster dose for children and adults two months after completing the primary vaccination schedule or as the last booster dose.
Monovalent vaccines against Covid-19 are still available in Basic Health Units (UBS) for the general population and are classified as “highly effective against the disease”.
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