Scientists who study pathogens are often called microbiologists, but their specific field of study can vary depending on the type of pathogen they focus on. Here are some examples:

Bacteriologists: Study bacteria, including those that cause disease.

Virologists: Study viruses, including those that cause disease.

Mycologists: Study fungi, including those that cause disease.

Parasitologists: Study parasites, including those that cause disease.

Other related fields:

* Immunologists: Study the immune system and how it responds to pathogens.

* Epidemiologists: Study the spread of infectious diseases in populations.

* Infectious disease specialists: Doctors who diagnose and treat infectious diseases.

It's important to note that there is often overlap between these fields. For example, a scientist who studies the influenza virus (a virus) might also be considered a virologist and an epidemiologist.