1. | through sexual contact with an infected person |
2. | from mother to child during pregnancy, delivery, or breastfeeding |
3. | via blood and blood products |
4. | vector borne |
1. | Swine flu | 2. | Dengue |
3. | Covid-19 | 4. | Avian influenza |
1. | Cocaine | 2. | Morphine |
3. | Barbiturates | 4. | Benzodiazepines |
1. | HIV is a retrovirus |
2. | HIV can be transmitted from an infected mother to her child through placenta. |
3. | The time lag between infection and the appearance of AIDS symptoms is 7-10 days. |
4. | HIV destroys helper T lymphocytes. |
1. | Bone marrow | Primary lymphoid organ |
2. | Thymus | Increases in size after puberty |
3. | Payer’s patches | Present in small intestine and appendix |
4. | Spleen | Has a large reservoir of RBCs |
1. | Foetus receiving antibodies from their mother, through placenta. |
2. | Immunity conferred by IgA antibodies present in colostrums. |
3. | Giving antivenom [containing antibodies against venom] after snake bite |
4. | A person developing immunity after natural infection by a pathogen |