SYDNEY/BEIJING (Reuters) - The death toll from COVID-19 surpassed half a million people on Sunday, according to a Reuters tally, a grim milestone for the global pandemic that seems to be resurgent in some countries even as other regions are still grappling with the first wave.

While the overall rate of death has flattened in recent weeks, health experts have expressed concerns about record numbers of new cases in countries like the United States, India and Brazil, as well as new outbreaks in parts of Asia.

officials on Sunday reported around 44,700 new cases and 508 additional deaths.

In just five months, the COVID-19 death toll has overtaken the number of people who die annually from malaria, one of the most deadly infectious diseases.

The death rate averages out to 78,000 per month, compared with 64,000 AIDS-related deaths and 36,000 malaria deaths, according to 2018 figures from the World Health Organization.

Public health experts are looking at how demographics affect the death rates in different regions.

Health experts caution that the official data likely does not tell the full story, with many believing that both cases and deaths have likely been underreported in some countries.