Health+and+hygeine

Optimal environmental conditions for human health

3 immune systems: Respiratory tract-


 * Dust
 * Infection
 * Bacterial disease
 * Fungal disease
 * Viral disease
 * Parasitic disease
 * Humidity
 * Poisonous gases
 * Asthma/croup/bronchitis caused by environment
 * Inhaled water etc/choking/coughing
 * Breathing patterns and capacity/exercise

Skin-
 * Contact dermititis
 * Infection
 * Bacterial disease
 * Fungal disease
 * Viral disease
 * Parasitic disease
 * Harmful chemicals
 * Skin hygiene
 * Sweat
 * Clothing/footwear

Gastric tract -
 * Poisoning
 * Harmful chemicals
 * Food poisoning
 * Water borne disease
 * Infection
 * Bacterial disease
 * Fungal disease
 * Viral disease
 * Parasitic disease
 * Dental health
 * Fibre