how long does the pertussin 200 last? ie weeks, months, years? is it an effective long term prophylactic or just when an epidemic is around? my elder daughter caught whooping cough when there was no epidemic and it wasn't actually diagnosed properly by the doctors until she was over the very worst of it, so i would be very keen to immunise my younger daughter homeopathically longterm if it were possible....? what are your thoughts pksinha?
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