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- https://bio.libretexts.org/Courses/City_College_of_San_Francisco/Introduction_to_Microbiology_OER_-_Ying_Liu/20%3A_Epidemiological_Studies_and_Public_Health/20.09%3A_Current_Epidemicsincreased stress or increase in the density of a vector species), a genetic change in the parasite population or the introduction of a new parasite to a host population (by movement of parasites or ho...increased stress or increase in the density of a vector species), a genetic change in the parasite population or the introduction of a new parasite to a host population (by movement of parasites or hosts). In the 20 th century three influenza pandemics occurred, each caused by the appearance of a new strain of the virus in humans, and killed tens of millions of people.
- https://bio.libretexts.org/Courses/Prince_Georges_Community_College/PGCC_Microbiology/05%3A_Infectious_Diseases_and_Epidemiology/5.06%3A_Introduction_to_Epidemiology/5.6.03%3A_Global_Public_Health/5.6.3I%3A_Current_EpidemicsIn the 20th century three influenza pandemics occurred, each caused by the appearance of a new strain of the virus in humans, and killed tens of millions of people. increased stress or increase in the...In the 20th century three influenza pandemics occurred, each caused by the appearance of a new strain of the virus in humans, and killed tens of millions of people. increased stress or increase in the density of a vector species), a genetic change in the parasite population or the introduction of a new parasite to a host population (by movement of parasites or hosts).
- https://bio.libretexts.org/Courses/North_Central_State_College/BIOL_1550%3A_Microbiology_(2025)/19%3A_Epidemiological_Studies_and_Public_Health/19.09%3A_Current_Epidemicsincreased stress or increase in the density of a vector species), a genetic change in the parasite population or the introduction of a new parasite to a host population (by movement of parasites or ho...increased stress or increase in the density of a vector species), a genetic change in the parasite population or the introduction of a new parasite to a host population (by movement of parasites or hosts). In the 20 th century three influenza pandemics occurred, each caused by the appearance of a new strain of the virus in humans, and killed tens of millions of people.
