Rodolfo spent hour after aggravating hour trying to register his elderly mother for a Covid-19 vaccination through a Mexican government website, only for the system to crash repeatedly.

“I spent three days fighting with the website,” he said. “My mom would have been unable to do it without me.”

After the site launched on Tuesday, millions of Mexicans over 60 who tried to register were met by an error message for days on end. And even when the page loaded, other users reported further delays while a separate government agency checks official ID numbers, only to deliver a message of “No response”.

Many countries, including Canada and EU member states, have struggled to roll out their vaccine programmes but Mexico’s disastrous launch came at a particularly bad time.