Microorganisms and Disease
Fatalities following influenza infection are usually due to the

bacterial superinfection
dehydration
damage to the heart muscle
formation of granulomas in the lung

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Microorganisms and Disease
The "A" subunit of diphtheria toxin

cause ADP ribosylation of a factor involved in protein synthesis
lysis macrophages with the release of cytokines
binds host cell receptors found on heart cells
forms cAMP that leads to fluid accumulation

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