Why isn’t hepatitis A vaccination recommended for sewage and solid waste disposal workers?

In published reports of three serologic surveys conducted among United States wastewater workers and appropriate comparison populations, no substantial or consistent increase in the prevalence of anti-HAV was identified among wastewater workers. No work-related instances of hepatitis A transmission have been reported among wastewater workers in the United States. In addition, in the United States, outbreaks of hepatitis A caused by flooding, which can carry raw sewage, have not been reported.