The European regulator has also called on EU member states to speed up their vaccination programs amid rising infections.
Several European countries have blamed an increase in the number of COVID-19 cases on the highly contagious Delta variant, which first appeared in India.
“Preliminary evidence suggests that two doses of a COVID-19 vaccine are necessary to provide adequate protection against the Delta variant,” the EMA said in a statement.
“Compliance with the recommended vaccination schedule is vital to benefit from the highest level of protection against the virus,” he added.
The regulator reaffirmed its approval of two doses of the Pfizer / BioNTech, Moderna and AstraZeneca vaccines for European citizens.
According to the European Center for Disease Prevention and Control (ECDC), the Delta variant of the coronavirus will account for 90% of cases by the end of August.
Studies have indicated that the variant is 40-60% more transmissible than previous strains of the virus.
“This makes it essential for countries to speed up immunization programs, including administration of second doses when recommended, and to fill immunity gaps and opportunities for the emergence of new variants, as soon as possible,” he said. declared the EMA.
But the authority also pointed to ECDC figures which suggest that nearly 30% or more of people over 80 have not yet completed the recommended vaccination program in ten EU countries.
Several countries have recently decided to tighten their health measures, in particular to encourage people who are still reluctant to be vaccinated.
The EMA also said on Wednesday that there was good scientific evidence that mixing doses of two different vaccines was “safe and effective” against COVID-19.
« [This strategy] can allow populations to be protected more quickly and to make better use of available vaccine stocks, ”said the regulator.
But the EMA said it was “too early” to say whether a booster dose of a vaccine would be needed in the future.
“There is not yet enough data from vaccination campaigns and ongoing studies to understand how long vaccine protection will last, also given the spread of variants,” the organization said.
In addition to promoting vaccinations, the European regulator has also urged citizens to maintain other measures, such as masks and social distancing, to prevent a resurgence of cases.