Epidemiological factors and the parenteral transmission mechanism
The widespread dissemination of the infection is inextricably linked with the injection of psychoactive substances. The parenteral mechanism occurs through the reuse of equipment contaminated with biological fluids containing the virus.
Drug addiction acts as a powerful epidemiological trigger:
- The overwhelming majority of involved individuals are young people (up to 60% are adolescents);
- The disease is characterized by high social contagiousness — one injection drug user draws an average of 4–5 people into the practice;
- The average age of users is 21 years, and life expectancy after the formation of regular dependence is limited to 4–5 years.
From a hygienic perspective, the only absolute guarantee of preventing parenteral infection among risk groups is the complete rejection of psychoactive substances and an increase in the sanitary culture of the population.
Laboratory diagnostics and screening algorithms
The standard for population screening is the detection of serological markers of the virus. Basic laboratory testing combines the search for two classes of antibodies (IgM, IgG) to HIV 1/2 and the capsid antigen p24.
| Screening parameter | Clinical characteristics |
|---|---|
| Analyzed markers | Antibodies IgM, IgG + capsid antigen p24 |
| Control timeframe in pregnant women | Third trimester of gestation (if no prior data available) |
| Level of evidence | Recommendation grade A, evidence level 2 |
| Routing upon a positive test | Referral to a specialized AIDS Prevention and Control Center |
When preparing for planned hospitalization, seropositive patients must be referred to the territorial AIDS Center to verify the diagnosis and rule out false-positive reactions.
Prevention of perinatal and nosocomial infection
The protection of newborns is based on preventing vertical transmission and stopping nosocomial contacts:
- Postnatal drug prophylaxis: prescribed to the newborn infant immediately after birth if the mother's diagnosis is established.
- Feeding correction: identification of the disease in the mother serves as an absolute contraindication to natural breastfeeding and early application to the breast.
- Verification features in children: standard serological tests in the first weeks of life are of low diagnostic value due to the circulation of maternal IgG antibodies. Preference is given to direct pathogen detection methods (PCR, culture isolation), while a fourfold increase in IgG serves only as delayed confirmation.
- Hospital hygiene: in obstetrical and pediatric inpatient facilities, staff hand hygiene before and after contact with the child is strictly monitored, and the use of exclusively disposable catheters, probes, and injection needles is ensured.
Screening formula "24-M-F": look for protein p24 and IgM + IgG antibodies (M + F), refer to the AIDS Center.
Class and exam questions
What antigen is detected in the combined HIV screening test?
Along with IgM and IgG class antibodies to types 1 and 2 of the virus, the capsid antigen p24 is determined.
Where is the patient referred upon initial detection of the infection prior to hospitalization?
The patient is referred to a specialized AIDS Prevention and Control Center for clinical diagnosis verification.
Is breastfeeding permitted if the mother has a confirmed HIV infection?
No, the presence of the immunodeficiency virus in the mother is a direct contraindication to natural infant feeding.
Why is serological analysis of low diagnostic value in newborns during the first weeks of life?
Maternal antibodies circulate in the infant's blood, therefore diagnostics are performed using direct methods (PCR or culture examination).
What else to study on this topic
- Epidemiological statistics of drug abuse and substance abuse among adolescents
- Clinical manifestations of inhalation poisoning by volatile toxic substances
- Sanitary-epidemiological regimen and hand hygiene in neonatal departments
- The relationship between the rise in HIV incidence and tuberculosis epidemiology in the Russian Federation
- The role of the Phthisiopulmonology and Infectious Diseases Center in the state registration of pathologies
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