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Updated: Aug 8, 2026

Evaluation of T Follicular Helper Cells and Germinal Center Response During Influenza A Virus Infection in Mice
Published on: June 27, 2020
[Chronic course of influenza with extrapulmonary involvement]
Influenza infection can cause extrapulmonary damage to the placenta and brain. These organs may harbor the virus long-term and produce interferon, a key immune defense factor.
Area of Science:
- Virology
- Immunology
- Pathology
Context:
- Investigated 265 placentas and 387 necropsies.
- Employed morphological, immunological, and virological methods.
Purpose:
- To investigate extrapulmonary influenza infection.
- To explore long-term viral survival in placental and brain tissues.
- To examine local immune responses in affected organs.
Summary:
- Demonstrated extrapulmonary influenza damage in 50 placentas and 17 brains.
- Discussed persisting, chronic, and manifesting influenza infection variants.
- Provided evidence for long-term influenza virus survival in brain and placental structures.
- Showcased secretion of local non-specific defense factors, such as interferon, by these organs.
Impact:
- Highlights potential for persistent influenza reservoirs in placenta and brain.
- Suggests novel mechanisms for influenza pathogenesis and chronicity.
- Underscores the role of local immune factors like interferon in influenza infection.
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