Question

Choose the correct causality model: Given that not all people with HIV develop AIDS, and people...

Choose the correct causality model:

Given that not all people with HIV develop AIDS, and people without HIV do not develop AIDS,

HIV is a ___ of AIDS.

A.

necessary and sufficient causality
B.

necessary but not sufficient causality
C.

neither necessary nor sufficient causality
D.

sufficient but not necessary causality
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Answer #1

Answer is B necessary but not sufficient causality

Infection by the Human Immunodeficiency Virus (HIV) is necessary for a person to develop acquired immunodeficiency syndrome (AIDS). However not all people infected with HIV develop the disease as certian other factors come into play such as hosts immunity. Therefore we can say that only HIV infection is not sufficient for a person to develop AIDS.

To elaborate on necessary and sufficient causes, a necessary cause is a causal factor whose presence is absolutely required for the occurrence of the effect. If disease does not develop without the factor being present, then we term the causative factor "necessary". Whereas a sufficient cause is the minimum set of factors or events required to produce a given outcome. When the sufficient cause is present the disease will definitely occur.

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