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All medication has the potential to cause allergies but some people can have allergic reactions to specific prescription or over-the-counter medications.

Chemicals such as pesticides, antibiotics and hormones are used to boost food production and ensure adequate food supply.

Conjunctivitis is an eye infection caused by a bacteria or virus. Symptoms include eye redness, a discharge and swollen lids. Conjunctivitis is treated with antibacterial eye drops or ointment. Children must not attend school or child care if they have conjunctivitis.

Many bacterial infections can be treated with antibiotics, but they are useless against viral infections.

The major symptom of whooping cough is a severe cough, which is often followed by a 'whooping' sound.

Careful prescribing of antibiotics will minimise the emergence of antimicrobial resistant strains of bacteria.

Streptococcal infection group A can cause sore throats (pharyngitis), scarlet fever or impetigo (school sores).

The Western obsession with cleanliness may be partly responsible for the increase in allergic asthma and conditions such as rhinitis.

Plague is a rare disease caused by the bacterium Yersinia pestis.

Impetigo (school sores) is a common skin infection caused by bacteria.