Answer:
Dr. Semmelweis, a physician from Austria, wanted to locate the cause of child-bed fever in his maternity wards. He suggested that the doctors in the hospital were transferring a disease-causing substance to the pregnant mothers because they were not washing their hands. His suggestion was a:
observation
Explanation:
Dr Semmelweis only observed what could have caused the child-bed fever since there is no migration of people from elsewhere it shows that it is only within the terrain are causing the transmission within themselves.
