modesofoutbreaktransmission-180616062132.pptx

outbreak investigation

1. Modes of outbreak transmission ( Disease transmission) Prepared by: Anish Dhakal (Aryan) MBBS Student Patan Academy of Health Sciences 1

2. 2

3. 3

4. Direct transmission 4 Direct contact Droplet infection

5. Direct transmission… 5 Contact with soil Inoculation into skin/Mucosa

6. Direct transmission… Transplacental ( Vertical) 6

7. Indirect transmission 7 Vehicle borne Fomite borne

8. Indirect transmission… Air Borne 8 Droplet nuclei Dust

9. Vector Borne 9 Mechanical Biological

10. Indirect transmission… Unclean hand and fingers 10

11. Modes of outbreak transmission 11 Common source Point Continuous Intermittent Person to person Index case with limited spread Propagated Mixed Other

12. Point source outbreak Single event Common incubation period 12

13. Continuous common source outbreak Broader incubation period Exposure to the source is prolonged 13

14. Intermittent common source outbreak Could be seasonal or weather related or a result of common exposure 14

15. Propagated outbreak People are infected through a source and ultimately they become source too No. of people increases in every generation 15

16. Index case with limited spread Single index infects other people Outbreak wanes when the infected people no longer transmit the infection to other susceptible people, perhaps because of successful control measures 16

17. Mixed epidemic Features of both common-source epidemics and propagated epidemics Common-source outbreak followed by secondary person-to-person spread 17

18. 18 THANK YOU