Examlex
A well-designed questionnaire can motivate the respondents and increase the response rate.
Viruses
Microscopic infectious agents that can only replicate inside the living cells of an organism and are capable of causing diseases.
Foreign Substance
A material or substance present in an organism or system that is not naturally produced or expected to be in that environment.
Immune Response
The body's defense mechanism against foreign substances or pathogens, involving both specific and nonspecific components.
HIV Virus
Human Immunodeficiency Virus, a virus that attacks the body's immune system and can lead to Acquired Immunodeficiency Syndrome (AIDS) if not treated.
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