
09/21/2025
When I was an intern, the HiB (Haemophilus influenza B) vaccine was new and only approved for children 15 months or more. I had the terrible privilege of seeing the devastating effects of that illness in normal babies. It might start as an ear infection or pneumonia, but for some it would cause cerebral abscesses. If the child survived, the affected areas of the brain were simply missing. The locations were random-- uncorrectable deafness, blindness, stroke-like symptoms, or the ability to learn or create memories lost in previously normal children.
That vaccine is now given at 2, 4, 6 and 15 months. The first shot is over 80% effective, the series is over 99%. The disease is now practically unheard of, but the bacteria continues to exist.
Haemophilus influenzae (formerly called Pfeiffer's bacillus or Bacillus influenzae) is a Gram-negative, non-motile, coccobacillary, facultatively anaerobic, capnophilic pathogenic bacterium of the family Pasteurellaceae. The bacteria are mesophilic and grow best at temperatures between 35 and 37 °C...