Rabies is an acute viral infectious disease resulting from infections with the rabies virus (Rabies virus), which belongs to the Rhabdoviridae family. This virus is transmitted primarily through bites of infected animals, resulting in progressive neurological and mental disorders. The incubation period can vary from several weeks to several months, after which early symptoms such as fever, headache, and discomfort at the site of the bite occur. Later, the disease is accompanied by more serious manifestations, including paresis, convulsions, agitation, and coma, which in turn can lead to death if adequate preventive measures are not taken.
History of the disease and interesting historical facts
The interesting historical context of the disease can be traced back to ancient times. The first mentions of rabies can be found in the works of Hippocrates and various medical texts of ancient Rome. The symptoms he described, such as aggressive behavior and sensitivity to light, of course, later found their reflection in more modern definitions of the disease. In the 16th century, scientist and anatomist Andreas Vesalius pointed out in his work the links between bites of the cervical vertebrae and the development of neurological symptoms in patients with rabies. In the 19th century, Louis Pasteur created the first rabies vaccine, which was a significant step in the fight against this disease. More than a century later, rabies remains a pressing issue due to the prevalence of the disease in some regions of the world.
Epidemiology
According to the World Health Organization, approximately 59,000 cases of rabies are registered worldwide each year, which is significantly hampered by the lack of timely vaccination and inadequate health care in some regions. The majority of cases occur in Asia and Africa, where the level of immunization of domestic animals remains low. More than 90% cases of infection in humans are associated with dog bites. It should be noted that rabies is an eradicable disease, provided that competent preventive measures are taken, such as vaccination of animals and the possibility of rapid access to post-exposure prophylaxis for people who have been in contact with potentially infected animals.
Genetic predisposition to this disease
Research into genetic susceptibility to rabies has focused primarily on the body’s immune responses to infections. In particular, genes associated with immune responses, such as IL6, TNF, IFNG, and genes encoding receptors for pathogens, play a key role in susceptibility to the disease. However, direct inheritance of susceptibility to rabies has not been established, as rabies is an infectious disease, not a hereditary one. Mutations that can significantly increase susceptibility to viruses are likely to be associated not so much with specific genes as with the general state of the individual’s immune system, which may also be related to other factors such as age, health, and immune status.
Risk factors for the development of this disease
Risk factors for rabies include the following categories:
- Physical factors: interaction with potentially infected animals (dogs, bats); living conditions in regions where rabid animals are common.
- Chemical factors: use of certain drugs or toxins that may reduce the body's immune response.
- Social factors: lack of awareness of diseases, insufficient vaccination of pets, poor level of health care.
If there is contact with wild or stray animals, especially in endemic regions, the risk of disease increases significantly.
Diagnosis of this disease
Diagnosis of rabies is based on a combination of clinical data, laboratory and radiological methods. The main symptoms of the disease include:
- Fever;
- Agitation and anxiety;
- Hydrophobia;
- Dysphagia;
- Paresis and paralysis.
Laboratory tests may include collection of saliva, cerebrospinal fluid, or biopsy material for subsequent analysis for the presence of the virus. In specialized centers, molecular diagnostic methods such as PCR may be used. Radiological examinations such as MRI can help to identify changes in the brain, but are usually not specific for this infection. Differential diagnosis should be made with other acute infections of the central nervous system, such as meningitis and encephalitis.
Treatment
Treatment of rabies is mainly symptomatic, as there is no specific therapy for the late stages of the disease. However, there are strategies aimed at preventing the disease after possible exposure:
- Post-exposure prophylaxis, which includes administration of vaccine and immunoglobulin within the first 24 hours after the bite;
- Elimination of a potential source of infection (eg, surgical debridement of a wound);
Pharmacological treatment includes the use of antiviral agents in experimental conditions. Surgical interventions make sense only in the context of improving the condition of the wound surface. In the early stages of the disease, normal body functions are maintained, including water and electrolyte balance, as well as supportive therapy to prevent complications.
List of medications used to treat this disease
Although there is no specific treatment for rabies, a number of drugs can be used to combat the disease:
- Rabies immunoglobulin;
- Rabies vaccines;
- Symptomatic agents (analgesics, antiemetics, etc.);
In addition, experimental studies are investigating the use of antiviral agents such as ribavirin and adefovir, but these approaches have not yet become standard in clinical practice.
Disease monitoring
Monitoring of the patient's condition with rabies is carried out at all stages, starting from the moment of seeking medical help. Control stages include:
- Assessment of progressive symptoms;
- Testing the effectiveness of post-exposure prophylaxis;
- Monitor for complications such as respiratory failure or infection.
The prognosis without treatment is extremely poor, with death generally occurring within 1-3 months of symptom onset. Complications may include the development of neuropsychiatric disorders and long-term dependence on health care.
Age-related features of the disease
The course of rabies may have specific features depending on the age group:
- In children: the likelihood of transmission of the virus is higher, as they may be more susceptible to bites. The clinical course is often more acute.
- In adults: Infection can be variable, but it can also result in high mortality, especially if medical care is inadequate. Atypical disease prognosis is common.
- In older people: the risk of developing concomitant diseases may aggravate the course of rabies. The prognosis may be more unfavorable due to a weak immune response.
Questions and Answers
- What are the main routes of transmission of rabies? The rabies virus is transmitted primarily through bites and scratches from potentially infected animals, especially dogs and bats.
- Is it possible to cure rabies after the first symptoms appear? Unfortunately, once clinical symptoms appear, recovery is virtually impossible and the disease is usually fatal.
- What is the importance of rabies vaccination? Vaccination remains the only effective way to prevent the disease, both for pets and for people at risk.
- What symptoms should you look out for immediately after an animal bite? If bitten, you should pay attention to symptoms such as fever, pain at the bite site, and general malaise, as these may be the first signs of rabies.
- What is the likelihood of getting rabies from a bite? The likelihood of contracting the disease depends on many factors, including the type of animal, the location of the bite, and the time that has passed since the bite. Timely vaccination significantly reduces the risk.
