MEXICO CITY, May 17 (Xinhua) -- COVID-19 cases in Mexico have been on the decline for four months, Undersecretary of Prevention and Health Promotion Hugo Lopez-Gatell said Tuesday.

While there have been some "slight variations" in case numbers over the past three weeks, there is an overall downward trend in infections, he told reporters at a press conference.

Health officials have also registered "less than one death per day on average in recent weeks," he added.

Meanwhile, the national vaccination campaign against COVID-19 has vaccinated almost 87.3 million residents out of a total population of 126 million, according to statistics.

Mexico has accumulated 5,751,579 confirmed COVID-19 cases and 324,611 related deaths since the onset of the pandemic in the country, according to the latest official data.