A viral screening is a medical test that detects a virus or the body’s immune response to it. It uses samples like swabs, blood, urine, or saliva to find viral genetic material (PCR), antigens, or antibodies. Screenings support diagnosis, early detection in asymptomatic people, blood-supply safety, and public-health surveillance to guide treatment and infection-control measures.

A viral profile typically includes tests for active infection (PCR/antigen) and antibody responses (IgM/IgG). Commonly screened viruses are hepatitis A, B and C; HIV; herpes family viruses (HSV‑1/2, VZV, CMV, EBV); and arboviruses like dengue or chikungunya. Panels may also include rubella, parvovirus B19 or respiratory viruses—specific components depend on the laboratory and clinical indication.

Antiviral screening is the systematic testing of compounds or biological agents to identify those that inhibit viral infection or replication. It uses cell-based assays, biochemical and molecular tests, and high-throughput platforms to measure antiviral activity, potency, and cytotoxicity. Positive hits undergo secondary validation, dose–response and mechanism studies, guiding lead optimization and preclinical development of safe, effective antiviral drugs.

A full viral screen is a panel of laboratory tests that detects current or past viral infections using antigen, antibody, and molecular (PCR) methods. It commonly includes HIV, hepatitis B and C, herpesviruses (HSV, CMV, EBV) and sometimes respiratory viruses. Results identify active infection, prior exposure or immunity, guide treatment decisions, and inform infection-control measures.

Yes. Viral screening includes molecular tests (PCR) detecting viral genetic material, antigen tests that identify viral proteins, and serological (antibody) tests indicating past infection or immunity. Other approaches include viral culture and pooled-sample screening for large populations. Choice depends on purpose—diagnosis, surveillance, or immunity assessment—and factors like timing, speed, cost, and test sensitivity.

In healthy people a normal viral count is effectively zero or undetectable in blood or tested samples. "Normal" varies by virus and laboratory method: for example, HIV is considered suppressed when below about 20–50 copies/mL, while respiratory viruses are usually reported as detected/undetected or by PCR cycle threshold. Interpretation depends on the specific virus, assay sensitivity, and clinical context—consult your clinician.