The viral explanation for schizophrenia suggests that brain abnormalities, and therefore schizophrenia, result from viral exposure:

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The viral hypothesis of schizophrenia suggests that exposure to viruses in utero, or before birth, can lead to brain abnormalities that may result in schizophrenia later in life. This theory is supported by epidemiological studies linking prenatal viral infections with an increased risk of schizophrenia in the offspring.

The Viral Explanation for Schizophrenia Suggests That Brain Abnormalities, and Therefore