Which factors contribute to outbreaks of measles after natural disasters? 1 contamination of drinking water with untreated sewage 2 lack of effective vaccination coverage in the population before the disaster 3 people living in overcrowded accommodation

A hurricane destroys a large town on an island. People move away from the town and set up tents, where sanitation is …

Which statement correctly explains why viruses are unaffected by penicillin?

Antibiotic-resistant strains of Mycobacterium tuberculosis are a major problem when treating TB. A new antibiotic, te…

Tuberculosis (TB), influenza and polio are examples of infectious diseases.

Salmon can be genetically modified (GM) to produce increased quantities of growth hormone, which is a protein. GM sal…

A student used a light microscope to observe a blood smear on a microscope slide. An eyepiece graticule was used to m…