NEHA Vector Control and Pest Management 2

Question 1

Which rodent species is a primary reservoir and source of hantavirus pulmonary syndrome in the western United States?

Accepted Answer

Deer mouse (Peromyscus maniculatus)

Answer

The deer mouse (Peromyscus maniculatus) is the primary reservoir host of Sin Nombre virus, which causes hantavirus pulmonary syndrome in the western United States.

Question 2

In environmental health inspections, what practice is most effective for preventing rodent entry into structures?

Accepted Answer

Exclusion — sealing all gaps and openings ≥ 1/4 inch in the structure's exterior

Answer

Exclusion is the most permanent and effective rodent control strategy, involving the physical sealing of all entry points ≥ 1/4 inch since mice can enter through very small gaps.

Question 3

What is the significance of Aedes aegypti in public health?

Accepted Answer

It is the primary vector of dengue, Zika, chikungunya, and yellow fever

Answer

Aedes aegypti is a highly competent vector responsible for transmitting dengue, Zika virus, chikungunya, and yellow fever, making it one of the most dangerous mosquitoes to public health.

Question 4

Which life stage of mosquitoes is targeted by larvicides such as Bti (Bacillus thuringiensis israelensis)?

Accepted Answer

Larvae in aquatic habitats

Answer

Larvicides like Bti are applied to standing water to kill mosquito larvae before they develop into adult disease-transmitting mosquitoes.

Question 5

What is the primary concern with cockroach infestations from an environmental health perspective?

Accepted Answer

They are associated with asthma, allergies, and mechanical transmission of pathogens

Answer

Cockroach allergens are a leading trigger of asthma and allergic reactions, particularly in children, and cockroaches can mechanically transmit pathogens including Salmonella and E. coli by contaminating food and surfaces.

NEHA - National Environmental Health Association Practice Test

NEHA - National Environmental Health Association Practice Test

NEHA Vector Control and Pest Management 2