Mexican scientist accuses government of deliberate pandemic mismanagement

A year into Mexico's pandemic, a Harvard-trained microbiologist published a book with an accusation that cut deeper than the usual policy critique. Laurie Ann Ximénez-Fyvie, who runs the molecular genetics laboratory at Mexico's National Autonomous University, titled her work "Un daño irreparable"—Irreparable Harm—and subtitled it with a word that stopped readers cold: criminal. The target was Hugo López-Gatell, the health undersecretary who had become the public face of Mexico's coronavirus response. Her argument was not that the government had tried and failed. It was that they had chosen not to try.

When the first confirmed case arrived on February 28, 2020, Mexico had the same tools available as every other nation. Ximénez-Fyvie, speaking a year later, laid out what those tools were: border controls to slow viral entry, contact tracing to isolate cases, widespread testing to catch asymptomatic spread. These were not exotic measures. They were epidemiology 101. Yet Mexico rejected them. The government never closed its airports to international travelers. It discouraged mask-wearing. It framed its strategy not as containment but as mitigation—a softer word for the same thing other countries had explicitly named: allowing the virus to spread through the population while trying to manage the pace so hospitals wouldn't collapse all at once. Herd immunity, in other words, though Mexico's leadership never said so aloud.

Ximénez-Fyvie's claim was that this was not incompetence born of ignorance. López-Gatell held a doctorate in epidemiology. He knew what worked. The decision to reject proven measures was conscious, she argued, and it was political. The president refused to wear a mask in public, so the health ministry echoed that refusal. The government feared the economic cost of border restrictions and the loss of tourism revenue, so it insisted such measures were unnecessary. By March 2021, Mexico had recorded more than 184,000 deaths and over two million confirmed cases. The true toll was almost certainly higher, because Mexico tested only people with advanced symptoms, leaving the asymptomatic—the primary vectors of spread—invisible and uncounted.

When asked why she used the word criminal, Ximénez-Fyvie did not retreat. She had initially believed the government's failures stemmed from lack of knowledge. But watching the response unfold, she came to a different conclusion: they knew what to do and chose not to do it. Knowing the tools existed to stop a catastrophe that was killing hundreds of thousands, and refusing to use them—that, she said, was criminal. She was careful to distinguish this from genocide or intentional murder. López-Gatell was not a sadist. He was, in her assessment, an irresponsible and negligent scientist who had subordinated epidemiology to politics.

The book drew attacks from multiple directions. Some critics argued that a dentist—her undergraduate degree—had no standing to critique pandemic policy, a charge she found absurd given her Harvard doctorate in medical sciences and two decades in academic research. Others accused her of politicizing a health crisis. She pushed back on this too. A mask is not political, she said. A virus does not care about your voting preference. The government had made these things political by tying them to the president's image. She was simply naming what she saw: decisions made for political reasons that cost lives.

When President López Obrador contracted COVID-19 in January 2021, Ximénez-Fyvie watched his response closely. Boris Johnson, after his own severe illness, had changed course and tightened Britain's restrictions. Donald Trump, by contrast, had emerged from his infection and continued dismissing scientific guidance. López Obrador chose Trump's path. He announced he would wear a mask only because he had already been infected and could no longer transmit the virus—a message to the population that survival meant you no longer needed precautions. He doubled down on negligence rather than reconsidering it.

The government never contacted Ximénez-Fyvie. When she approached Mexico City officials to offer her expertise, they declined. She had become, in their view, an enemy—though she insisted she was criticizing policy, not the nation itself. By the time of her interview with BBC Mundo, she had moved past anger about accountability. The dead could not be brought back. No prosecution or removal from office would undo that. What mattered now was whether Mexico would change course while hundreds of thousands of lives still hung in the balance. The United States, under new leadership willing to listen to scientists, was already demonstrating that reversal was possible. Mexico could do the same. The question was whether it would.