Question

The germ theory of diseases was established by
A) Louis Pasteur
B) Robert Koch
C) Lister
D) Alexander Fleming

Answer 1

Hint: "Germ" may apply not only to a bacterium, but to any form of microorganism or indeed nonliving disease-causing pathogens, such as fungi, protists, viruses, or viroids. Infectious diseases are also diseases invaded by pathogens.

Complete answer:
For certain illnesses, the germ hypothesis of illness is the scientific explanation generally recognised. It notes that disease can result from microorganisms known as pathogens or "germs." Humans, other species, and other living hosts are surrounded by these tiny creatures, too tiny to see without magnification.

Now, let us find the solution from the options-
- The germ hypothesis of sickness was proposed by Louis Pasteur. This hypothesis explains that the illness is caused by microorganisms that cannot be detected by naked eyes. There are species that are restricted and translucent. For activities like development, these species are dependent on the host. He proved that fermentation is a product of the sugar activity of the microorganism.
- The discovery of the anthrax causative factor by Robert Koch contributed to the creation of a standardized collection of postulates which could be used to establish the origin of so many infectious diseases. Thus, option B is not the correct option.
- To sterilize surgical methods and to disinfect wounds, Lister launched carbolic acid. Thus, option C is not the correct option.
- The first to say that a Penicillium mould would contain an antibacterial material was the Scottish physician Alexander Fleming, and the first to focus the active substance included, which he called penicillin, the first modern antibiotic, in 1928. Thus, option D is not the correct option.

Thus, the correct answer is option (A) Louis Pasteur.

Note: Even if a pathogen is the primary cause of a disease, the nature of the disease is also determined by environmental and genetic influences, and whether a possible host organism gets infected when introduced to the pathogen.