Example: Route of Transmission Flow chart Round1 Round2 Round3 Karen Janet Bot o
ID: 301612 • Letter: E
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Example: Route of Transmission Flow chart Round1 Round2 Round3 Karen Janet Bot or ve Andrew Jennifer The chart above shows that in Round 1 Mary and Dave exchanged fuds. Sin John Round 1, they pass on the disease to Bob and Andrew in Round 2, and o e they are both positive in Then Bob and Andrew pass it on to Janet and John, respectively 1). To determine the original carrier of the disease, the people involved in the original exchange must be tested ginof the disease can onlybetracedback to an original exchange (Round "Simulated Bodily Fluid" set aside of the two infected The two individuals in will have to submit their microfuge is placed into each microfuge. while a clear or pink ur class who were determined to beinvolved in the original exchange (Rourid 1) uge tubes for further evaluation. A drop of the"DOisease Indicator Solution A change of color to blue indicates negative for the "Simulated Disease," further o color will indicates a positive indication for the disease in an actual epidemic it is almost impossible to trace a disease back to an original car c situation, one can not trace a disease as easily as in this simulation. In an open system, another round of "Simulat of "Simulated with a small we Bodily Fluid" exchange, then 16 people would an trace back an original exchange. If you had completed of infected people doubles ld be infected With each round of transmission the number Questions: 1. How is a disease caused? 2. Were you surprised by the number of people who acquired the disease? Explain your answer. 3. Explain how one person can spread disease to many others? 4. How can disease transmission be traced to the original carrie? in the example Data Table, explain why Ralph and Sheila tested negative in Round 1 and 2 exchange, eventhough they exchanged "bodily fluids" with Janet who had tested positive. 5. 6. How imany people tested positive in your class? What was the percentage of postive to negative? Coppmaiter. Pemission ib granted to reproduce unlimited quandue within anyone school building. o 1994 WARS Natural Science Establshment hc Allright reserved WARDExplanation / Answer
1. A disease can be caused by a number of factors represented by external factors such as pathogens or internal malfunctions. However, in the given example, the disease is caused by an exchange of bodily fluids.
2. All the persons acquired the disease through the exchange of fluids. On that basis, one case surprises me, Andrew should have passed the disease to Jennifer, not John.
3. A person can spread the disease to many others through direct or indirect contact.
Direct contact includes:
(a) Person-to-person contact. Through physical contact or through an exchange of body fluids, eg., STDs.
(b) Droplet method. For example, through coughing and sneezing.
Indirect contact spreads diseases through the air like measles; contaminated objects, food, water etc.
4. As in the given example which is a closed system, the disease can be traced through "disease indicator solution". However such solutions or any other cannot be applied at the mass level, so it is almost impossible to trace a disease in an open case.
5. It is possibly because the time at which Ralph and Shiela were tested, they had not yet exchanged fluids with Janet.
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