The study, conducted in Malawi, Kenya, and Ghana, did not obtain informed consent from each parent whose child participated, but rather considered consent “implied” because of the particular experimental design.

The public health emergency has spurred a mass vaccination campaign.

Just half of respondents in Eastern Europe agree that vaccines are safe.

The World Health Organization and its partners will test the public health effect of immunization in parts of Malawi, Ghana, and Kenya.

The World Health Organization reports that a number of countries are experiencing “sizeable” numbers of the infection due to a failure to vaccinate.

Scientists debate why the number of whooping cough cases is up, and whether the effectiveness of a vaccine introduced within the last two decades is to blame.

The WHO reports more than 41,000 cases in the region in the first half of 2018.

Changsheng is found to have forged records for a rabies vaccine and is accused of distributing thousands of substandard DPT immunizations to be used in children.

The increase is associated with travel to Europe, where large outbreaks are occurring.