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Mexican states that border U.S. have higher rates of COVID exposure, study says

Mexican states that border the U.S. have higher rates of COVID-19 exposure, according to a study of random blood samples taken across the country between February and December 2020.

The report found that the highest rates of coronavirus antibodies were found in blood samples from people in Baja California, a northwest Mexican state that borders California, and Chihuahua, a state that borders New Mexico and Texas, both with 40.7 percent.

In comparison, antibodies were found in only 26.6 percent of blood samples taken in western states, AP reported. In total, antibodies were found in over 30 percent of all blood samples—suggesting that as many as one-third of Mexicans had been exposed to the virus by the end of 2020.

For more reporting from the Associated Press, see below.

Mexican states that border the U.S. have higher rates of COVID-19 exposure, according to a study of random blood samples taken across the country between February and December 2020. Above, a teacher receives a dose of a COVID-19 vaccine at a center installed at the Benito Juarez Auditorium in Guadalajara, Mexico, on April 28, 2021.
Ulises Ruiz / AFP/Getty Images

Victor Borja of the Mexican Social Security Institute said the rate might have risen by as much as 10 percentage points on average nationwide following the steep upsurge in cases in January. But even if the exposure rate is currently as much as 43.5 %, Borja stressed the country was still far from herd immunity.

Authorities have suggested that with almost 350,000 virus-related deaths, and about 40 million Mexicans exposed to the virus, the mortality rate could be just under 1 percent.

Moreover, the study suggested about 86% of those infected had developed effective antibodies, but that around 14% hadn’t and could be re-infected.

Mexican authorities also announced they detected three cases of the South African variant on Tuesday. The U.K. and Brazilian variants have already been detected in the country, but Mexico does relatively little variant testing.

The country has received about 22.6 million vaccine doses and given almost 17 million shots, covering over 12 million people, some of whom have gotten two doses. That remains a small amount for a country of 126 million. Mexico has vaccinated many of its senior citizens and plans to begin vaccinating people between the ages of 50 and 59 in May.

Assistant Health Secretary Hugo López-Gatell said Mexico will soon start receiving Pfizer vaccines from U.S. plants, rather than from plants in Europe. That will make the logistics of importing the shots easier.

There have been over 216,000 test-confirmed deaths related to COVID-19, but Mexico does so little testing that many people die without having been tested.

A preliminary government review of death certificates suggested excess deaths attributable to COVID-19 reached 316,344 by the start of March. There have been 29,395 test-confirmed deaths since then, for a total of 346,110.

Newsweek, in partnership with NewsGuard, is dedicated to providing accurate and verifiable vaccine and health information. With NewsGuard’s HealthGuard browser extension, users can verify if a website is a trustworthy source of health information. Visit the Newsweek VaxFacts website to learn more and to download the HealthGuard browser extension.

Mexico COVID-19
Mexican states that border the U.S. have higher rates of COVID-19 exposure, according to a study of random blood samples taken across the country between February and December 2020. In this February 24, 2021, file photo, a medical worker holds up a vial of the Sputnik V coronavirus vaccine, as the city health department conducts a mass vaccination campaign for Mexicans over age 60, at Palacio de los Deportes in Mexico City.
Rebecca Blackwell/Associated Press

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