A childhood vaccine may help prevent severe Covid-19 infections, while cigarette smoke increases the risk of contracting the virus, according to the latest study.
Growing scepticism of vaccines in Europe, especially in countries like France should be a cause for concern.
Globally, nearly three times as many measles cases were reported from January to July this year than in the same period in 2018, the WHO said.
The Pan-American Health Organization, the regional arm of the World Health Organization, signals a more than 30 percent spike in measles cases worldwide last year as compared with 2016.
In Europe, there were more than 21,000 cases of measles and 35 deaths last year, a fourfold increase in cases compared to the previous year.
Large measles outbreaks still inflict parts of Europe, where some people don't get vaccinated.
Once-controlled measles has returned to the fore in Venezuela since a political turmoil started. The country's health system collapsed due to a crippling shortage of medicines and vaccines, as well as decaying hospitals and an exodus of doctors.
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