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Vaccination
A _______ is another way to try and stay one step ahead of communicable diseases.
emerging diseases
These are communicable diseases whose occurrence in humans have increased within the past 2 decades.
Tears
What is an example of a chemical barrier?
pathogen
An ______ is an organism that causes disease.
viruses
The common cold and influenza are caused by ______
vectors
Malaria, West Nile Virus, and Lyme disease are examples of diseases that are spread by ___.
communicable diseases
_______ is the spread of disease from one living organism to another
Bacteria
_______ is a single cell microorganism that lives everywhere on earth.
direct contact
This type of contact can include touching, biting, kissing, or sexual contact.
our immune system
What is our best ally in the fight against communicable diseases?