Common Diseases in Humans — Core Principles
Core Principles
Common diseases in humans are broadly categorized into infectious and non-infectious types. Infectious diseases are caused by pathogens (bacteria, viruses, fungi, protozoans, helminths) and are transmissible.
Key examples include Typhoid (*Salmonella typhi*), Pneumonia (*Streptococcus pneumoniae*), Common Cold (Rhinoviruses), Malaria (*Plasmodium* spp.), Amoebiasis (*Entamoeba histolytica*), Ascariasis (*Ascaris lumbricoides*), Filariasis (*Wuchereria* spp.
), and Ringworm (fungi like *Microsporum*). Transmission occurs via contaminated food/water, air droplets, direct contact, or vectors. Symptoms vary widely but often involve fever, pain, and specific organ dysfunction.
Diagnosis relies on tests like Widal for typhoid, blood smears for malaria, and stool examination for helminths. Prevention emphasizes hygiene, sanitation, vector control, and vaccination. Non-infectious diseases, like cancer and diabetes, are not transmissible and arise from genetic, lifestyle, and environmental factors.
Their prevention focuses on healthy living and early detection. Understanding these distinctions, causative agents, modes of transmission, symptoms, and preventive measures is critical for NEET aspirants.
Important Differences
vs Infectious Diseases vs. Non-infectious Diseases
| Aspect | This Topic | Infectious Diseases vs. Non-infectious Diseases |
|---|---|---|
| Causative Agent | Pathogens (bacteria, viruses, fungi, protozoans, helminths) | Genetic factors, lifestyle, environmental factors, aging |
| Transmissibility | Transmissible from person to person, animal to person, or environment to person | Not transmissible from person to person |
| Examples | Common cold, malaria, typhoid, AIDS, tuberculosis | Diabetes, hypertension, heart disease, cancer, asthma |
| Prevention Strategy | Hygiene, sanitation, vaccination, vector control, antibiotics/antivirals | Healthy lifestyle, diet, exercise, avoiding risk factors, regular check-ups |
| Immune System Role | Directly targeted by immune response; vaccines induce immunity | Immune system may be involved in pathogenesis (e.g., autoimmune diseases) but not in direct defense against external pathogens |