Viral infection symptoms are caused by a combination of viral activity and immune response
Viral infection symptoms and disease severity are driven by a combination of direct viral replication and the host's subsequent immune and inflammatory responses.
Multiple retrieved reviews across different viral infections (such as RSV, dengue, FIPV, and COVID-19) consistently establish that pathology results from the interplay between viral activity and host immune responses, supporting the claim without contradiction.
Georgakopoulou VE, Pitiriga VC. Immunomodulation in Respiratory Syncytial Virus Infection: Mechanisms, Therapeutic Targets, and Clinical Implications.. 2025. https://doi.org/10.3390/microorganisms13081876
States that severe RSV disease is driven by viral replication combined with dysregulated host immune responses.
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de Melo VC, de Oliveira KI, Kipper M, Bagatini MD, da Silva GB. Purinergic signaling in dengue infection: modulation of P2 receptors as a potential therapeutic strategy.. 2026. https://doi.org/10.1007/s11302-026-10149-3
Indicates that dengue pathogenesis involves both direct viral activity and an intense, dysregulated inflammatory immune response.
Lee HM. Immune Cell Signaling in Feline Infectious Peritonitis Virus Infection and Implications for Vaccine Design.. 2026. https://doi.org/10.3390/vaccines14050435
Notes that feline infectious peritonitis severity is driven by viral replication alongside excessive macrophage-centered immune signaling.
Petrovan A, Puiu L, Pop CM. COVID-19, the disease that changed the world.. 2026. https://doi.org/10.15386/mpr-2957
Describes severe COVID-19 as being triggered by viral activity combined with an imbalanced immune response and cytokine storm.
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