The role of cell culture vaccines in the treatment of herpes
Specific prophylaxis of recurrent herpes requires a special approach. Unlike etiotropic therapy used in the acute phase (using chemotherapeutic agents such as acyclovir, valacyclovir, famciclovir, idoxuridine, vidarabine, as well as topical ointments and immunomodulators), vaccination is performed exclusively during the remission period. For this purpose, an inactivated cell culture herpes vaccine is used, which includes antigens of HSV-1 and HSV-2 strains. The drug is administered repeatedly, which effectively reduces the frequency and severity of disease relapses.
Routine immunization against tick-borne encephalitis
Protection against tick-borne encephalitis includes several approaches, where killed cell culture vaccines play a key role in routine specific prophylaxis. Vaccination is strictly indicated for populations permanently residing in endemic areas, as well as for individuals traveling there during the spring-summer season.
It is important to distinguish routine vaccination from other methods of protection:
- Emergency seroprophylaxis: performed after a tick bite (if PCR or ELISA confirms the presence of the virus) using human immunoglobulin. The preparation is administered strictly within the first 96 hours. Administration after the fourth day (during the incubation period, which lasts up to 28 days) is strictly contraindicated due to the risk of the antibody-dependent enhancement phenomenon, which can worsen the course of the disease. For this reason, the preparation is often not used in children under 14 years of age.
- Passive prophylaxis: administration of immunoglobulin 96 hours before visiting the focus area (protection develops in 24 hours and lasts about 4 weeks).
- Nonspecific prophylaxis: consumption exclusively of boiled milk to interrupt the alimentary transmission route.
Cell culture vaccines against rabies
Modern specific immunoprophylaxis of rabies relies on the use of inactivated cell culture vaccines (inactivation is achieved by UV irradiation or gamma rays). Concurrently, recombinant analogs containing glycoprotein G are being developed.
There are two main indications for the use of antirabies vaccines:
- Pre-exposure (prophylactic) vaccination: administered before exposure to the pathogen for occupational risk groups (veterinarians, dog handlers).
- Post-exposure (therapeutic and prophylactic) vaccination: prescribed to individuals following animal bites.
The unique protection mechanism in rabies lies in the fact that active post-vaccination immunity manages to fully develop during the incubation period of the disease. In severe injuries or multiple bites, vaccination is supplemented by passive immunization—the administration of rabies immunoglobulin, which provides immediate protection until the body produces its own antibodies.
Application in viral infections with a fecal-oral transmission mechanism
Cell culture vaccines are also used for the prophylaxis of viral infections affecting the gastrointestinal tract (where local immunity is formed). Such diseases are characterized by an acute phase lasting 2–3 weeks, the absence of chronic forms, and complete recovery. In children under five years of age, the infection is often asymptomatic.
Following the disease, a strong, lifelong post-infection immunity is formed, mediated by IgG class antibodies (while IgM serves as the acute phase marker, persisting for 4–6 months). Transplacental maternal antibodies circulate in infants during their first year of life.
For active specific prophylaxis, inactivated cell culture and recombinant genetic engineering vaccines are successfully used. Alternatively, based on epidemiological indications, passive protection with immunoglobulin can be used (effective for about three months), along with nonspecific sanitary and hygienic measures (control of water supply and food hygiene). Notably, the virological method (viral isolation on cell cultures) is not used in routine diagnostics of these infections due to the lack of available techniques, yielding to the detection of antigens in feces and IgM in blood serum by ELISA, RIA, and immune electron microscopy.
To remember the timelines for tick-borne encephalitis prophylaxis, use the "Rule of Fours": immunoglobulin administration is permitted only in the first 4 days (96 hours), passive protection before visiting the focus area is administered 4 days prior and lasts for 4 weeks, and after the 4th day, the injection is strictly prohibited.
Class and exam questions
Can cell culture herpes vaccine be administered during an acute flare-up?
No, vaccine prophylaxis of recurrent herpes is performed strictly during remission. In the acute phase, etiotropic therapy with chemotherapeutic agents and immunomodulators is indicated.
Why is rabies vaccination effective even after a bite?
The defense mechanism is based on the fact that active immunity from the administration of an inactivated cell culture vaccine manages to form during the incubation period of the disease, preventing the development of symptoms.
How does routine tick-borne encephalitis prophylaxis differ from emergency prophylaxis?
Routine prophylaxis is carried out using killed cell culture vaccines before the start of the tick activity season. Emergency prophylaxis is performed using human immunoglobulin strictly in the first 96 hours after a confirmed bite by an infected tick.
Is the cell culture method used for routine diagnostics of acute intestinal viral infections?
No, virus isolation (culture testing) is not performed in routine practice due to the lack of available methods. The basis of diagnostics is ELISA, RIA, and the detection of antigens in stool.
What else to study on this topic
- Etiotropic therapy of herpesvirus infection: an overview of chemotherapeutic agents
- The phenomenon of antibody-dependent enhancement in tick-borne encephalitis
- Regimens of emergency seroprophylaxis and passive immunization
- Recombinant vaccines: mechanism of action and prospects
- Markers of the acute phase and post-infection immunity (IgM and IgG)
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