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Periodic infections are recurrent illnesses that occur at regular intervals, often due to the cyclical nature of certain pathogens or host susceptibility. These infections can be caused by bacteria, viruses, or parasites that have specific life cycles involving hosts and environmental conditions. For example, some bacteria like
Neisseria gonorrhoeae
and
Treponema pallidum
(causing syphilis) exhibit periodic outbreaks due to factors such as host immunity waning over time or changes in environmental conditions. Similarly, viral infections like influenza can show periodic patterns influenced by seasonal changes and human behavior. Treatment and prevention strategies often focus on breaking these cycles through vaccination, antibiotics, and public health measures to reduce transmission during peak periods.