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American Focus > Blog > Health and Wellness > Understanding how ENSO cycles impact immunity and outbreak patterns
Health and Wellness

Understanding how ENSO cycles impact immunity and outbreak patterns

Last updated: March 7, 2025 2:32 pm
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Understanding how ENSO cycles impact immunity and outbreak patterns
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The interplay between climate phenomena such as El Niño and infectious disease outbreaks has been a topic of interest for researchers studying the impact of extreme weather events on public health. Variations in temperature, precipitation, and humidity can significantly influence the spread of infectious diseases by altering the habitats of disease-transmitting vectors like mosquitoes. Additionally, extreme weather events can disrupt health care responses, further complicating disease control efforts.

One well-known climate phenomenon that has been linked to infectious disease outbreaks is the El Niño–Southern Oscillation (ENSO). ENSO consists of two main phases – El Niño, characterized by warmer ocean temperatures, and La Niña, characterized by cooler ocean temperatures. These alternating phases can lead to fluctuations in extreme weather patterns and may influence the spread of diseases such as cholera, dengue, malaria, respiratory syncytial virus (RSV), and Rift Valley fever.

While ENSO events can be forecasted months in advance, there have been limited successful public health interventions based on these predictions. Factors such as geographic variability, differences in timing between ENSO cycles and disease outbreaks, and population immunity resulting from previous outbreaks all contribute to the complexity of linking ENSO events directly to disease outbreaks.

In a recent study published in GeoHealth, researchers led by Maya V. Chung investigated the longer-term interactions between ENSO cycles and various infectious diseases. Using two modeling approaches, the team explored how back-to-back ENSO events could affect populations susceptible to disease outbreaks over multiple years and how humidity variations associated with ENSO influenced disease transmission, specifically focusing on an airborne human coronavirus, HCoV-HKU1.

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The study found that immune responses for infectious diseases often lagged behind the initial El Niño and La Niña events, sometimes by more than a year. When consecutive ENSO events occurred, the effects could lead to longer-lasting and larger disease outbreaks a year or more later. The researchers suggest that risk managers should consider population immunity as a predictor of ENSO’s influence on disease spread, allowing for better planning of interventions in advance and improved health outcomes.

Understanding the complex interactions between climate phenomena like ENSO and infectious disease outbreaks is crucial for public health preparedness. By incorporating climate data into disease modeling and intervention strategies, researchers and policymakers can work towards mitigating the impact of extreme weather events on public health.

TAGGED:cyclesENSOImmunityimpactOutbreakpatternsunderstanding
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