PSYCH 040: Neuropsychiatric Aspects of Other Infectious Diseases (Non-HIV)

Infectious diseases can profoundly affect the brain, often in ways that blur the boundary between neurology and psychiatry. This chapter explores how non-HIV infections - bacterial, viral, fungal, and parasitic - can lead to a wide spectrum of neuropsychiatric presentations.In this episode, we examine how pathogens may directly invade the central nervous system or trigger indirect effects through inflammation, immune response, or systemic illness. Conditions such as encephalitis, meningitis, and post-infectious syndromes can disrupt cognition, mood, behaviour, and consciousness.We explore presentations ranging from acute delirium and psychosis to longer-term cognitive and emotional changes. In some cases, neuropsychiatric symptoms may be the earliest or most prominent feature.A key theme is vigilance. Infectious causes must always be considered in acute or atypical psychiatric presentations, particularly when onset is rapid or accompanied by systemic features.This chapter highlights the dynamic relationship between infection and brain function - where external agents can transiently or permanently alter the internal landscape of the mind.Key Takeaways* Non-HIV infections can directly or indirectly affect brain function.* Mechanisms include direct invasion, inflammation, and immune-mediated processes.* Presentations include delirium, psychosis, cognitive impairment, and behavioural change.* Acute onset or atypical features should raise suspicion of infection.* Early recognition is critical, as many causes are treatable.* Neuropsychiatric symptoms may be the first manifestation of infection.* Brain function is highly sensitive to systemic and inflammatory disturbances. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe