Hallberg's Picture of Health: Symptom-free carriers
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A new study suggests the increase in whooping cough cases is largely due to a growth in asymptomatic carriers.
A new study suggests the increase in whooping cough cases is largely due to a growth in asymptomatic carriers.
Impide el desarrollo de los síntomas, pero no su transmisión
Various explanations have been suggested — the protection afforded by the vaccine wanes over time; the bacterium has evolved to…