Related Experiment Video

Updated: Jul 6, 2026

Extraction of Saliva, Haemolymph, Salivary Glands, and Midgut from Individual Ticks (Acari: Ixodidae)
03:22

Extraction of Saliva, Haemolymph, Salivary Glands, and Midgut from Individual Ticks (Acari: Ixodidae)

Published on: October 31, 2025

Spotted fever group rickettsioses in Himachal Pradesh

S K Mahajan1, R Kashyap, N Sankhyan

  • 1Department of Medicine, IG Medical College, Shimla, India.

The Journal of the Association of Physicians of India
|April 15, 2008
PubMed

Insights

Spotted fevers group (SFG) rickettsioses are emerging tick-borne diseases. This study confirms the first cases of SFG rickettsioses in India's Himalayan region using microimmunofluorescence assays.

Area of Science:

  • * Infectious Diseases
  • * Medical Entomology
  • * Microbiology

Background:

  • * Rickettsiae are increasingly recognized as significant emerging and reemerging pathogens globally.
  • * The Spotted Fevers Group (SFG) comprises numerous tick- and mite-borne zoonotic infections caused by closely related rickettsiae.
  • * SFG rickettsiae in Southeast Asia remain largely uncharacterized, with limited documented cases in India's Himalayan region.

Observation:

  • * Two cases of SFG rickettsioses were identified in patients from the northern hilly region of India.
  • * The clinical presentation and epidemiological context of these cases are detailed.
  • * Diagnostic confirmation was achieved through specific microimmunofluorescence assays.

Findings:

  • * The study provides the first confirmed report of SFG rickettsioses in the Himalayan region of India.
  • * Microimmunofluorescence assay proved effective in identifying SFG rickettsiae in the confirmed cases.
  • * This finding expands the known geographical distribution of SFG rickettsiae.

Implications:

  • * Highlights the need for increased awareness and diagnostic capabilities for SFG rickettsioses in India and surrounding regions.
  • * Suggests potential endemicity of SFG rickettsiae in the Himalayan belt, necessitating further epidemiological investigation.
  • * Emphasizes the importance of vector surveillance and control for tick- and mite-borne zoonotic diseases.

More Related Videos

An Electroporation Method to Transform Rickettsia spp. with a Fluorescent Protein-Expressing Shuttle Vector in Tick Cell Lines07:18

An Electroporation Method to Transform Rickettsia spp. with a Fluorescent Protein-Expressing Shuttle Vector in Tick Cell Lines

Published on: October 11, 2022

Tick Artificial Membrane Feeding for Ixodes scapularis08:53

Tick Artificial Membrane Feeding for Ixodes scapularis

Published on: November 30, 2022

Related Concept Videos

Rocky Mountain Spotted Fever01:26

Rocky Mountain Spotted Fever

Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.
Intracellular Movement of Viruses and Bacteria01:10

Intracellular Movement of Viruses and Bacteria

Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a virus that...
Bacterial Phylum Spirochaetes01:30

Bacterial Phylum Spirochaetes

Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased by a...
American Trypanosomiasis01:22

American Trypanosomiasis

Chagas disease, or American trypanosomiasis, is a vector-borne parasitic infection caused by Trypanosoma cruzi, a flagellated protozoan (kinetoplastid) of the family Trypanosomatidae. The disease is endemic in Latin America, although cases are increasingly reported worldwide due to human migration. Transmission most commonly occurs when feces of infected triatomine bugs contaminate bite wounds or mucosal surfaces; additional routes include congenital, transfusional, transplant-related, and oral...
Endocarditis II: Clinical Features of Infective Endocarditis01:25

Endocarditis II: Clinical Features of Infective Endocarditis

Endocarditis can present various clinical features depending on the causative organism and the patient's underlying health conditions. Initially, the clinical features of infective endocarditis develop gradually, presenting with nonspecific symptoms that can be easily mistaken for other illnesses.General SymptomsEarly symptoms of infective endocarditis are fever, chills, weakness, malaise, fatigue, and weight loss. These symptoms reflect the systemic nature of the infection and the body's...
Leishmaniasis01:30

Leishmaniasis

Leishmaniasis is a protozoal disease caused by species of the genus Leishmania and transmitted through the bite of infected female sandflies. The parasite exists in two principal morphological forms during its life cycle. A sandfly acquires intracellular amastigotes from an infected reservoir host, such as a dog. Within the sandfly, these forms differentiate into motile, flagellated promastigotes. During a subsequent blood meal, promastigotes are injected into the human host, where they...