Five little doctors checking out germs

Five little doctors were checking out germs. One forgot to wash his hands. So four fine doctors and one sick doctor who could not check out. Four little doctors were checking out germs, one moved to another state so only three doctors were checking out germs. Three doctors were checking out germs. One changed job, so only two doctors remained. Two doctors were checking out germs. One doctor checked out his germs three doctors save the day.