evidence: After an effective measles vaccine was introduced in 1963, the incidence of measles decreased significantly. Nevertheless, measles remains a common disease in certain regions and continues to account for nearly 50% of the 1.6 million deaths caused each year by vaccine-preventable childhood diseases. The incidence of measles in the United States and worldwide is increasing, with outbreaks being reported particularly in populations with low vaccination rates. [9] [...] Since 2008, France has been experiencing an outbreak of measles, which has not yet begun to slacken. [26] Over the same period, outbreaks have also been occurring in the 46 countries of the WHO African Region. [27] Worldwide, most reported cases of measles occur in Africa. [28] In 2019, the Samoan Ministry of Health declared a measles outbreak, the first Pacific island country to take action with the global resurgence of measles. [29] Vaccine hesitancy and low vaccination rates in Samoa stemmed from an erroneous mixed vaccine administration resulting in the deaths of two children in 2018. [30]