Emerging Microbes
Scientists usually define emerging microbes as those that have appeared only recently in a population or have existed but are rapidly increasing in incidence or geographic range. Recent examples of such disease-causing microbes are methicillin-resistant Staphylococcus aureus (MRSA) bacteria, West Nile virus, and 2009 H1N1 influenza virus.

Fruit bats in India and Malaysia have been found to carry Nipah virus.
Some newly emeriging/emerged microbes:
- 2009 H1N1 influenza virus
- Ebola virus
- H5N1 avian influenza virus
- Marburg virus
- MRSA bacteria
- Multidrug-resistant and extensively drug-resistant tuberculosis bacteria
- Nipah virus
- SARS virus
- West Nile virus