What Is Scrub Typhus Causes Transmission Symptoms and Treatment
Scrub Typhus is an acute infectious disease spread among human beings through bites of infected chiggers or trombiculid mites, which is mainly caused by the parasite family Rickettsiaceae. The bacteria Orientia tsutsugamushi belongs to the Rickettsiaceae family is responsible for spreading the disease called Scrub Typhus. The bacterium R.tsutsugamushi acts as a causative agent of Scrub Typhus. The Leptotrombidium (Trombicula) akamushi and L. deliens are staying as vectors of the disease. The Scrub Typhus is also known as bush typhus.
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Origin of Scrub Typhus
Scrub Typhus originated from Southeast Asia. This disease was first described in 1899, and scientists researched and investigated scrub typhus in 1906-1932. This disease invaded Japanese troops and killed thousands of troops during world war II. Scrub Typhus created much impact in the pacific region.
Types of Typhus
The Typus is a bacterial infection, mainly caused by rickettsia or orientia bacteria. It spreads to human beings through infected mites, fleas, or lice and creates typhus eschar. There are three types of Typhus. They are.
Murine Typhus
It is mainly caused by infected fleas and bites of rats. Most of the cases are reported from the United states.
Epidemic Typhus
Epidemic typhus, also called louse-borne typhus. This is one of the rarely spread infections, mainly caused due to the infected lice body. Another type of epidemic typhus spreads from infected squirrels.
Scrub Typhus
Scrub Typhus is mainly spread through infected chiggers or mites. Many cases are recorded from Southeast Asia, China, Japan, India, and northern Australia.
How Does Scrub Typhus Spread?
The Scrub Typhus is not transmitted from one person to another like, cough or cold. The bacteria Orientia tsutsugamushi is transmitted to the larva of mites in their early stages. When infected louse, flea, tick, or mite feed the blood from human being Scrub Typhus are transmitted. The infection gets spread throughout the body in 10-12 days.
The children affected by tsutsugamushi scrub easily recover. The malnourished adults will get affected soon. People with diabetes mellitus, alcoholism or renal disorders face huge risk due to orientia tsutsugamushi. This increases the mortality rate. The epidemic typhus undergoes untreated and mortality rate ranges from 10 to 60 percent, and untreated scrub typhus mortality ranges stand at 30 percent.
Scrub Typhus Symptoms
The person who got infected has Scrub Typhus symptoms within 2 weeks. They can absorb the following symptoms.
Fever
Chills
Headache
Muscular pain
Body pain
Red or pink rashes
Loss of appetite
Stomach Pain
Vomiting
Enlarged lymph nodes
A person who got infected with scrub typhus will require 10 to 12 days for developing symptoms even after biting an infected mite. Reddish or pinkish spots, which are known as typhus eschar, start appearing. The person begins to experience typhus fever scrub, headache, chills, and general pains, along with enlargement of lymph glands. After a week, a pinkish rash starts to develop over the skin of the trunk and may extend to the arms and legs. These symptoms may last for one to two weeks. But at the unusual stage, it may take three or four weeks to end up the cause. The person at the severe stage may experience impairment of heart and circulatory function which may result in organ damage and bleeding.
Diagnosis and Testing Scrub Typhus
The diagnosis of Scrub Typhus is quite difficult, as the scrub typhus symptoms are the same as other diseases like Dengue, Malaria, and Brucellosis. The physician will diagnose this disease only with the patient’s travel history, essential blood test, biopsy tests.
Tests to Find Scrub Typhus
To find the tsutsugamushi scrub’s infection, the following tests can be undergone.
Skin Biopsy: A sample of infected skin send for testing
Western Blot: A test to identify the presence of typhus in infected skin
Immunofluorescence Test: Technician use fluorescent dyes to detect typhus antigen in samples of serum taken from infected person’s bloodstream
Other Blood Tests: To analyze the presence of bacteria from infected bloodstreams.
Scrub Typhus Treatment
Scrub Typhus is a curable disease. It requires simple scrub typhus treatment, dose medication and care for a few weeks. Doxycycline is a perfect antibiotic, which can be prescribed to many age groups. Ciprofloxacin is the best alternative for adults, who cannot intake Doxycycline. Chloramphenicol will also provide fast recovery, but cannot be prescribed to pregnant women.
Complications of Typhus
The person who is experiencing Scrub Typhus treatment dose may also face some complications like Hepatitis, Gastrointestinal Hemorrhage, and Hypovolem.
Prevention Methods
There is no vaccine for Tsutsugamushi scrub
Offen applying insect repellent is the best method to avoid typhus eschar
People can avoid contact with Tsutsugamushi scrub infected chiggers for escaping from risk
Maintaining adequate personal hygiene
Can take necessary measures to control the rodent population.
Must avoid travelling to the affected area.
FAQs on Scrub Typhus Infection and Its Clinical Features
1. What is scrub typhus?
Scrub typhus is an infectious disease caused by the bacterium Orientia tsutsugamushi and transmitted to humans through the bite of infected chigger mites (larval mites).
- It is a type of rickettsial disease.
- Common in the "tsutsugamushi triangle" region of Asia-Pacific.
- Characterized by fever, rash, and sometimes a dark scab called an eschar at the bite site.
2. What causes scrub typhus?
Scrub typhus is caused by the intracellular bacterium Orientia tsutsugamushi.
- This bacterium infects humans through bites of infected trombiculid mite larvae (chiggers).
- It invades and multiplies inside endothelial cells and immune cells.
- The infection leads to inflammation of blood vessels, known as vasculitis.
3. How is scrub typhus transmitted to humans?
Scrub typhus is transmitted to humans through the bite of infected chigger mites, which are the larval stage of trombiculid mites.
- Mites become infected by feeding on small mammals like rodents.
- The bacteria are maintained in mites through transovarial transmission (from mother mite to eggs).
- Humans are accidental hosts when they enter mite-infested vegetation.
4. What are the symptoms of scrub typhus?
The main symptoms of scrub typhus are high fever, headache, body aches, and the formation of an eschar at the bite site.
- Sudden onset of high fever
- Severe headache and muscle pain
- Swollen lymph nodes (lymphadenopathy)
- Maculopapular rash in some patients
- Dark scab (eschar) at the chigger bite site
5. What is an eschar in scrub typhus?
An eschar in scrub typhus is a painless, black, crusted lesion that forms at the site of a chigger bite.
- It begins as a small red papule.
- Progresses to a vesicle and then a necrotic scab.
- Surrounded by a red inflammatory halo.
6. How is scrub typhus diagnosed?
Scrub typhus is diagnosed based on clinical symptoms and confirmed by laboratory tests detecting Orientia tsutsugamushi or antibodies against it.
- Clinical signs like fever and eschar.
- Serological tests such as IgM ELISA.
- Molecular tests like PCR (polymerase chain reaction).
7. What is the treatment for scrub typhus?
Scrub typhus is treated effectively with antibiotics such as doxycycline or azithromycin.
- Doxycycline is the first-line treatment for adults.
- Azithromycin is preferred in pregnant women and children.
- Early treatment usually leads to rapid recovery within 48 hours.
8. How does Orientia tsutsugamushi infect the body?
Orientia tsutsugamushi infects the body by invading endothelial and immune cells and multiplying inside them.
- Enters the bloodstream after a chigger bite.
- Invades endothelial cells lining blood vessels.
- Causes inflammation and vasculitis.
- Leads to leakage of blood vessels and organ damage.
9. Where is scrub typhus commonly found?
Scrub typhus is commonly found in the "tsutsugamushi triangle," a region covering parts of South Asia, Southeast Asia, East Asia, and northern Australia.
- Rural and forested areas with dense vegetation.
- Regions with high populations of rodents and mites.
- Agricultural and scrubland environments.
10. How can scrub typhus be prevented?
Scrub typhus can be prevented by avoiding chigger bites and reducing exposure to mite-infested areas.
- Wear protective clothing in grassy or forested areas.
- Use insect repellents containing DEET.
- Clear vegetation around living areas.
- Maintain rodent control measures.
