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Lecture 6


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Alexandra Marin

LECTURE 6 SOCIAL NETWORKS & HEALTH Mechanisms are the processes which cause one thing to produce another CONTAGION: most illnesses that spread from person to person are transmitted by FIRST contact contagion After 9 transmisisons, contagion of 100 people rises to 11,000 people It is important because it is different from the spread of other things, for every 20 people who got it-18 people got it from them. Exponential growth leads to epidmeic, contagion affects more than non-contagion people NON-CONTAGION MODEL: 100 infective people, each time about 200 people get infected (linear effect) The types of networks matter as the structure can affect exposure: mode of transmission 1. COLDS/FLUS: 2. CHOLERA (people using same watter means they live near eachother 3. STDS (sexual interaction, needles, blood contact) NETWORK STRUCUTURE AFFECTS EXPOSURE Models of Contagion Networks: A) Core Infection Model : sexual ties- people in the group have sex with eachother B) Inverse Core Model: groups of pelpe are highly sexually active but not having sex with eachother, they have sex with people outside the group C) Bridge Between Disjoint Populations: people from two different population separate from one another D) Spanning Tree : people have one or two partners every noe and then, theyre arent any cycles STUDY: JEFFERSON HIGH: identified sexual/romantic partners from a roster Isolation of community is important factor as it is sigicant for the patterns of partnes and sexual partnership choices – nothing to do for fun. JH: Spinning Tree Network: disease doesn’t travel between components, if someone in the component gets a STD it doesn’t leave the componenant, there is a large cycle in the spinning tree network, much easy for intervention, if blocked off or cut off a pthway then transmission of disease is not likely. There is a large cycle, which suggests that if we block off a particualr tie, disease spread would be harder, only in the case of spanning tree network, as some of the others this would cause no interruption Once cycles begin to develop, this is where you will start to see epidemics take off. NETWORKS & SUSCEPTIBILITY Most research on netowrks and contagion focus on how network strucutres exposure-Networks effet whether or not you are exposed to contagion Network s affect exposure and probability of susceptibility 2 concepts to Contagion : if you are exposed & if you get it-susceptibility Cohen: argues that even controlling for exposure, networks affect susceptibility, but in the end exposure matters a whole ot Study: quarantined and exposed and given virus: found that people with more diverse networks were less likely to get sick even after given the virus People who have more diverse networks are more likley ot be exposed to colds even if they are less susceptible to illness, but the more diverse networks are, the more exposure=get more colds - even if they are less BEHAVIOURAL INFLUENCE: Homphily can also be caused by influence Influence changes behaviors and behaviors affect health Influence often takes the form of threshold co
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