Biology Notes: Human Health and Disease Ch-7: Human Health & Disease Health: A state of complete physical, mental, and social well-being, not merely the absence of disease. Good health is maintained by balanced diet, personal hygiene, and regular exercise. Common Infectious Diseases 1. Bacterial Diseases: Typhoid: Caused by Salmonella typhi . Enters via contaminated food/water. Symptoms: High fever, weaknes...
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