Infectious diseases result from biological agents invading host organisms, categorized into bacteria, viruses, fungi, protozoa, and helminths. Bacterial pathogens are prokaryotic organisms: Mycobacterium tuberculosis causes tuberculosis, Vibrio cholerae produces cholera through enterotoxins, Salmonella typhi causes typhoid fever (diagnosed via the Widal test), and Clostridium tetani produces neurotoxins causing tetanus. Viral pathogens are obligate intracellular parasites containing RNA or DNA genomes within a protein capsid. Major viral pathologies include Poliomyelitis (poliovirus targeting motor neurons), Rabies (Rhabdovirus causing fatal encephalomyelitis), Dengue and Chikungunya (transmitted by the daytime-biting female Aedes aegypti mosquito), and COVID-19 (caused by SARS-CoV-2). Protozoan diseases include Malaria, caused by Plasmodium species (P. falciparum, P. vivax) transmitted by the female Anopheles mosquito, and Kala-azar (visceral leishmaniasis), transmitted by the sandfly Phlebotomus argentipes. Immunization establishes protective immunological memory. Edward Jenner pioneered vaccination in 1796 using cowpox against smallpox. Modern immunization regimens include Bacillus Calmette-Guerin (BCG) for tuberculosis, Oral Polio Vaccine (OPV/Sabin), Inactivated Polio Vaccine (IPV/Salk), and MMR (Measles, Mumps, Rubella) vaccines.
High-yield conceptual summaries for competitive exams and rapid revision.
Bacterial diseases (TB, cholera, typhoid, tetanus) are treatable with targeted antibiotics, unlike viral infections.
Malaria is caused by the protozoan parasite Plasmodium and transmitted through the vector female Anopheles mosquito.
Dengue, Yellow Fever, and Zika viruses are transmitted to humans through the vector mosquito Aedes aegypti.
Edward Jenner developed the first successful vaccine in 1796, utilizing cowpox inoculation to confer immunity against smallpox.
The BCG vaccine provides immunity against Mycobacterium tuberculosis, administered intradermally at birth or during early infancy.
Showing 25 Curated Questions76 Total in Bank
1ID: GK-CYBR-00266
easyMalware, Spyware, Worms & Ransomware
What is the primary operational distinction between a computer worm and a conventional computer virus?
Verified Explanation
A virus requires a host executable file and human intervention (like opening an infected attachment) to execute and propagate. In contrast, a computer worm is a standalone self-replicating program that exploits network vulnerabilities to spread autonomously across connected devices without human action.
2ID: GK-CYBR-00325
easyMalware, Spyware, Worms & Ransomware
What fundamental operational difference distinguishes a computer worm from a traditional computer virus?
Verified Explanation
A computer virus attaches itself to an executable host file and relies on human action (launching the program) to spread. In contrast, a computer worm is a standalone program that self-replicates across networks autonomously by exploiting system vulnerabilities.
3ID: GK-HLTH-00103
mediumUniversal Immunization & Disease Control
What is the natural wildlife reservoir host of the deadly zoonotic Nipah virus that has caused recurrent localized encephalitis outbreaks in Kerala?
Verified Explanation
Fruit bats belonging to the genus Pteropus (specifically Pteropus medius, the Indian flying fox) are the natural reservoir hosts of Nipah virus. Humans contract infection through consumption of date palm sap or fruits contaminated with bat saliva or urine, or through human-to-human transmission.
4ID: GK-HLTH-00165
hardUniversal Immunization & Disease Control
Under international biosafety regulations, what Biosafety Level (BSL) containment is strictly required for handling live clinical cultures of the highly lethal Nipah virus?
Verified Explanation
Because Nipah virus is a Risk Group 4 henipavirus with high case fatality (40–75%), severe neurological/respiratory pathology, and lack of licensed treatment, live viral manipulation requires maximum containment inside Biosafety Level 4 (BSL-4) facilities, such as ICMR-NIV Pune.
5ID: GK-HLTH-00277
easyUniversal Immunization & Disease Control
What is the natural reservoir host of the Nipah virus, which has caused recurrent sporadic outbreaks in Kerala?
Verified Explanation
Fruit bats belonging to the genus Pteropus (commonly known as Indian flying foxes) are the natural reservoir hosts of the Nipah virus. Humans become infected through direct contact with infected bats, domestic animals (like pigs), or consuming date palm sap or fruits contaminated by bat secretions. Nipah causes severe encephalitis and acute respiratory distress with high mortality.
6ID: GK-HLTH-00335
easyUniversal Immunization Programme & Epidemic Control
Which natural wildlife reservoir hosts the Nipah virus, a Biosafety Level-4 zoonotic pathogen that has caused recurrent encephalitis outbreaks in Kerala?
Verified Explanation
Fruit bats belonging to the genus Pteropus (commonly known as Indian flying foxes) are the natural reservoir hosts of the deadly zoonotic Nipah virus, transmitting the virus to humans through bat secretions or contaminated fruits/toddy.
7ID: GK-HLTH-00347
hardUniversal Immunization Programme & Epidemic Control
Which congenital anatomical malformation in newborns is causally linked to maternal Zika virus infection during the first and second trimesters of pregnancy?
Verified Explanation
Maternal infection with Zika virus (a mosquito-borne flavivirus transmitted by Aedes aegypti) during pregnancy can disrupt fetal neural progenitor cell development, causing Congenital Zika Syndrome characterized by severe microcephaly, intracranial calcifications, and retinal damage.
8ID: GK-HLTH-00394
easyUniversal Immunization Programme & Epidemic Control
Which animal serves as the primary natural reservoir host for the zoonotic Nipah virus that has caused recurring outbreak clusters in Kerala?
Verified Explanation
Pteropus fruit bats (commonly known as flying foxes) are the natural reservoir hosts of Nipah virus, a Biosafety Level-4 (BSL-4) Henipavirus capable of causing severe encephalitis and respiratory distress in humans through bat-to-human or human-to-human transmission.
9ID: GK-HLTH-00461
mediumUniversal Immunization Programme & Epidemic Control
What is the natural reservoir host of the Nipah virus, an emerging biosafety level 4 (BSL-4) zoonotic pathogen responsible for localized encephalitis outbreaks in Kerala and West Bengal?
Verified Explanation
Fruit bats belonging to the genus Pteropus (commonly known as flying foxes) are the natural reservoir hosts of the Nipah virus (a Henipavirus). Transmission to humans occurs through consumption of raw date palm sap or fruits contaminated with bat saliva or urine, as well as direct human-to-human contact.
10ID: GK-BODY-00227
mediumDiseases, Pathology & Immunology
Dengue fever, caused by Dengue virus (DENV-1 to DENV-4 flavivirus), is transmitted to humans primarily by which day-biting mosquito vector?
Verified Explanation
Dengue virus is transmitted to humans primarily by female Aedes aegypti (and secondarily Aedes albopictus) mosquitoes, which breed in domestic clean water containers.
11ID: GK-BODY-00648
hardVaccines Immunology
Recombinant Human Papillomavirus (HPV) vaccines (such as Gardasil-9) prevent cervical neoplasia by deploying non-infectious Virus-Like Particles (VLPs) self-assembled from recombinant:
Verified Explanation
HPV vaccines consist of non-infectious, non-oncogenic Virus-Like Particles (VLPs) assembled from recombinant L1 major capsid proteins expressed in yeast (Saccharomyces cerevisiae) or insect cells.
12ID: GK-CYBR-00206
easyMalware, Spyware, Worms & Ransomware
What is the primary difference between a Computer Virus and a Computer Worm?
Verified Explanation
Computer viruses attach themselves to host files and require human execution to spread, whereas worms are standalone programs that replicate autonomously across networks without human assistance.
13ID: GK-CYBR-00385
easyMalware, Spyware, Worms & Ransomware
What key characteristic fundamentally distinguishes a Computer Worm from a standard Computer Virus?
Verified Explanation
Unlike viruses (which require human intervention to execute and attach to host files), worms are standalone programs that replicate autonomously across network vulnerabilities.
14ID: GK-CYBR-00504
easyMalware, Spyware, Worms & Ransomware
What fundamental characteristic distinguishes a computer Worm from a traditional computer Virus?
Verified Explanation
Unlike viruses (which require human intervention to execute an infected host program), a worm is self-replicating and propagates autonomously across network connections by exploiting system vulnerabilities.
15ID: GK-BODY-00082
easyDiseases Pathogens
Which viral disease, caused by the Varicella-Zoster Virus (VZV), presents with an itchy blistering skin rash in children and can reactivate later in adults as Shingles?
Verified Explanation
Following primary chickenpox infection, VZV remains latent in dorsal root ganglia for decades, reactivating as painful localized herpes zoster (shingles).
16ID: GK-BODY-00090
easyDiseases Pathogens
What is the vector that transmits Dengue Virus, Chikungunya, and Zika Virus to humans in tropical and subtropical regions?
Verified Explanation
Aedes aegypti breeds in clean stagnant urban water containers, biting primarily during early morning and late afternoon daylight hours.
17ID: GK-BODY-00124
mediumVaccines Immunology
The "Natural Killer Cells" (NK Cells) of the innate immune system identify and destroy virus-infected and tumor cells based on which "Missing-Self" recognition mechanism?
Verified Explanation
Because many viruses and cancers downregulate MHC Class I to evade cytotoxic T cells, NK cell inhibitory receptors (KIRs) lose suppression, triggering target cell lysis.
18ID: GK-BODY-00159
easyDiseases, Pathology & Immunology
Dengue fever, Chikungunya, and Zika virus infections are transmitted to humans predominantly through the daytime bites of infected female mosquitoes of which genus?
Verified Explanation
Aedes mosquitoes (specifically Aedes aegypti and Aedes albopictus), recognized by black and white striped markings on their legs, are the primary vectors of Dengue, Chikungunya, Yellow Fever, and Zika.
19ID: GK-BODY-00262
easyClinical Diagnostics & Medical Discoveries
Who developed the first successful vaccine in 1796 by using cowpox virus to confer immunity against smallpox?
Verified Explanation
Edward Jenner is recognized as the pioneer of smallpox vaccine and the father of immunology after inoculating James Phipps with cowpox in 1796.
20ID: GK-BODY-00365
easyDiseases, Pathology & Immunology
Which virus specifically targets and infects human CD4+ T helper lymphocytes, leading to Acquired Immunodeficiency Syndrome (AIDS)?
Verified Explanation
HIV is a retrovirus that binds to the CD4 receptor and CCR5/CXCR4 coreceptors on helper T cells, replicating via reverse transcriptase and progressively compromising cell-mediated immunity.
21ID: GK-BODY-00630
mediumDiseases, Pathology & Immunology
Human Immunodeficiency Virus (HIV) selectively targets and destroys which specific immune cell population, leading to the collapse of cell-mediated immunity in AIDS?
Verified Explanation
HIV surface glycoprotein gp120 binds with high affinity to CD4 receptors on T-helper lymphocytes, replicating inside and lysing them, causing progressive immunodeficiency when CD4 counts drop below 200 cells/μL.
22ID: GK-DAYS-00235
mediumHealth Human Rights Days
World Hepatitis Day is observed on 28 July to mark the birth anniversary of which Nobel Prize-winning scientist who discovered the Hepatitis B virus (HBV)?
Verified Explanation
Dr. Baruch Blumberg discovered the Hepatitis B virus in 1967 and developed the first Hepatitis B vaccine, winning the 1976 Nobel Prize in Medicine.
23ID: GK-DAYS-00398
hardHealth Human Rights Days
World Hepatitis Day is celebrated annually on July 28 to honor the birthday of which Nobel laureate who discovered the Hepatitis B virus and developed its first vaccine?
Verified Explanation
Dr. Baruch Blumberg discovered the Hepatitis B virus (HBV) in 1967 and received the 1976 Nobel Prize in Medicine.
24ID: GK-DAYS-00463
hardHealth Human Rights Days
World Hepatitis Day is celebrated on 28 July to honour the birthday of which Nobel laureate who discovered the Hepatitis B virus (HBV) and developed the first Hepatitis B vaccine?
Verified Explanation
Dr. Baruch S. Blumberg discovered the Hepatitis B virus (the Australia antigen) in 1967 and created the diagnostic test and vaccine, winning the 1976 Nobel Prize in Medicine.
25ID: GK-DAYS-00625
mediumHealth Human Rights Days
World Hepatitis Day is observed every year on July 28 to mark the birthday of which Nobel laureate physician who discovered the Hepatitis B virus?
Verified Explanation
Dr. Baruch Blumberg discovered Hepatitis B virus in 1967 and developed the first diagnostic test and vaccine, winning the 1976 Nobel Prize.