The statement, issued by Assistant Health Secretary Hugo Lopez-Gatell on Sunday, is likely to revive debate about Mexico's death toll, currently at 76,430, the fourth-highest in the world.

"When will the final statistics on deaths from COVID-19 be ready? Certainly, a couple of years after the first year of the pandemic," Lopez-Gatell said, adding that work would be left to the country's statistics institute.

Officials have acknowledged in the past the figure is a significant undercount because it includes only those who died after a positive test result, almost always at a hospital.

Mexico does very little testing and many people die without a test.

But the Mexican government has avoided adjusting its death toll upward to account for people who died at home or weren't tested.

Some parts of the country like Mexico City have begun conducting their own recalculations, finding "excess deaths" likely caused by coronavirus were at least double official figures.

The issue is a significant one in Mexico, because President Andres Manuel Lopez Obrador has frequently compared Mexico's death rates to those of other countries in a bid to convince the public his administration isn't doing a bad job at handling the pandemic.

But many other countries have attempted to adjust official figures to account for spikes in deaths that coincide with virus outbreaks.

But Lopez-Gatell placed in doubt Sunday whether the figure was important or whether it could really be measured.

He described the definitive death toll as "one of these technical details" and said the pandemic "cannot be measured".

Australian Associated Press