Mexico has been grossly underestimating its Covid-19 death toll, according to a growing number of independent studies suggesting there have been tens of thousands of deaths in excess of the official count, casting doubt on president Andrés Manuel López Obrador’s insistence that the pandemic has been tamed.

As of Friday, Mexico has officially reported 283,511 infections and 29,189 deaths among its 129m population. But the true picture may be far worse.

One study by independent researchers Mario Romero and Laurianne Despeghel shows at least 3.5 times more deaths in Mexico City than the official data, an undercount of some 22,705 deaths in the capital alone.

In another, Raúl Rojas, a Mexican professor of artificial intelligence at Berlin University, calculated that Mexico could have as many as 6m cases and nearly 78,000 deaths — almost three times the official count.

“I find it incredible that instead of giving numbers, they’re hiding them to conceal the seriousness of the situation,” he said.

More than half the world’s average daily deaths from the virus are now in Latin America, making it one of the global centres for Covid-19. Brazil has the world’s highest official number of daily deaths, but with an average of 4.7 new deaths per 1m people in the last week, Mexico and Brazil are neck and neck in proportion to population.

Mexico is only counting cases and deaths that have been confirmed by a laboratory — and only 610,495 people have been tested. In part because of the low level of testing, some 67 per cent of tests come back positive — an indication that many more cases are being missed.

A patient is treated with oxygen in a Covid-19 hospital in Naucalpan © Rebecca Blackwell/AP

Hugo López-Gatell, the health under-secretary and coronavirus tsar, said mass testing would be a waste of time and money, and the World Health Organisation’s appeal to “test, test, test” had been understood in a “deformed, erroneous and distorted” way.

But without robust testing and tracking, experts fear Mexico will struggle to tame any new outbreaks as Latin America’s second-biggest economy reopens.

Dr López-Gatell acknowledged in an interview with the Washington Post that total deaths in Mexico city from March to May were triple the usual level, according to an official but as yet unpublished study. The FT’s requests for an interview have not been granted.

Until that study is published, or official mortality data is released next year, the closest estimates available come from Ms Romero, a software developer and data analyst, and Ms Despeghel, a consultant in economics.

A chart showing that Mexico’s testing has been very limited, sending its test positivity rate soaring

They tallied the number of death certificates issued in Mexico City since the start of the pandemic, regardless of the cause of death, and found a 126 per cent increase in the past three months compared with the average for the same period from 2016-18. Official data on total deaths in 2019 is not yet available.

According to their latest count, published in news magazine Nexos on July 3, there were 22,705 excess deaths in the capital by the end of June. Officially, Mexico City has confirmed 6,642 deaths from coronavirus.

“In the last week, we had 104 per cent excess mortality — twice as many people than normal died in Mexico City,” said Ms Despeghel. That compared with as much as 219 per cent five weeks ago. “It’s coming down, but it’s still high.”

In Mexico City, excess deaths have risen more slowly than in some cities, such as New York, but “here it’s taking longer to taper”, said Mr Romero.

A chart showing that mortality rates have soared in urban Latin America, with overall excess deaths often much higher than reported Covid-19 deaths

Since countries’ methodologies for reporting Covid-19 fatalities differ widely. David Spiegelhalter, professor of the public understanding of risk at Cambridge university in the UK, describes tracking excess deaths as “the only unbiased comparison you can make between different countries”.

Mr López Obrador, who initially minimised the risk from Covid-19 and refuses to wear a face mask, now insists Mexico is past the worst — even as the number of cases keeps rising.

Officials have denied hiding the figures, but data has been uploaded to civil registry websites slowly and in the state of Mexico a site publishing similar data was taken down altogether, Ms Despeghel and Mr Romero said.

In his study, Prof Rojas noticed that official national statistics in June attributed 40 per cent more deaths to May than had been reported at the time. To correct for administrative delays, he calculated that Mexico’s death toll needed to be multiplied by 1.4.

Although in the capital, there appear to be at least three times more deaths than usual, he used the conservative assumption that nationwide figures were under-reported by 50 per cent.

President Andres Manuel Lopez Obrador insists Mexico is past the worst © Fernando Llano/AP

Correcting both for delays in reporting and under-registration, that implied 77,753 deaths in the whole country, he said. Assuming a 2 per cent mortality rate, that meant as many as 6m infections.

Ms Romero and Ms Despeghel’s findings chime with a separate analysis of death certificates from May by Mexicans Against Corruption and Impunity (MCCI), a think-tank. It found nearly four times more deaths in the capital attributed to coronavirus than in official data.

Two other studies, tracking calls to emergency services, also challenge the official count. In Tijuana, UCLA and Mexican academics with the Red Cross found 195 excess out-of-hospital deaths, between mid-April and mid-May, versus eight in the official tally.

In Mexico City, Quinto Elemento Lab, an investigative journalism non-profit body, found that 1,179 people had died at home or outside hospitals of coronavirus-linked conditions between March 23 and May 27, while just 329 were reported officially.

At a news conference on Thursday night, Dr López-Gatell acknowledged the same situation with excess deaths “is happening all over the country . . . We’re not hiding anything”.

He has already said that official data showed that infections “hit a peak then unfortunately continued”, exceeding official predictions in several cities. He now says the pandemic could last until October.


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