Summary: <p>Doctors Pearl Kendrick and Grace Eldering developed the first effective vaccine against whooping cough. By 1940 Michigan was distributing the vaccine, which would put an end to the deaths.</p>
Summary: <p>Doctors Pearl Kendrick and Grace Eldering developed the first effective vaccine against whooping cough. By 1940 Michigan was distributing the vaccine, which would put an end to the deaths.</p>