Wyz-Visualization & Insights

Vast2011 MC1: Characterization of an Epidemic Spread

Background

Methodology

Visualization & Insights

Feedback

Visualization & Insights

Origin and Epidemic Spread

Identify approximately where the outbreak started on the map (ground zero location). Outline the affected area. Explain how you arrived at your conclusion.
After a quick browse around the dataset, we can find that the content of over 1M microblog messages contains all aspects of life. So first, we start by extracting flu-related microblog messages. A list of keywords was selected to filter raw data. The list consists of keywords including flu, chill, fever, sweat, ache, pain, fatigue, cough, breath, nausea, vomit, diarrhea, and lymph, which are from observed symptoms and human judgement. After filtering, there are 71939 flu-related microblog messages left.

Visualization	Insights
	Infer the disease outbreak date The line chart is to show daily total flu-related microblog messages trend. It can be seen from the graph that there is a significant rise on May 17th.
	Map of flu-related microblog messages on May 17 The few reports were scattered over the map.
	Map of flu-related microblog messages on May 18 From the geographical map, it is clear to see that the disease broke out in the Downtown and then spread to Eastside.
	Map of flu-related microblog messages on May 17 On May 19th, the disease had spread throughout the downstream of the Vast river.
	Magnification of ground zero location, May 18 If we zoom in, we can deduce from this picture that first 'ground zero' was in Downtown, around the Dome, City Hospital, and Convention Center.

Epidemic Spread

Mode of transmission

Present a hypothesis on how the infection is being transmitted. For example, is the method of transmission person-­to­-person, airborne, waterborne, or something else? Identify the trends that support your hypothesis.

Person-­to­-person

Considering that most of the flu is spread by person-­to­-person, we will focus on this route of transmission first.

Visualization	Insights
	Number of flu-related microblog messages breakdown by hour, May 18 2011 As above, we assumed that the disease broke out on the May 18th. On that day, most of conversations started from 7 AM and suddenly rose at 5 PM while reaching a peak at 6 PM. The period just fit the work time.
	Map of flu-related microblog messages by work status As is shown in the diagram, blue points stand for people location during work time from 7 am to 5 pm while yellow points represent the rest of the day. There is an intensive blue part in the downtown area during work time, which facilitates the spread of the disease.
	Map of flu-related microblog messages on May 18 From the geographical map, it is clear to see that the disease broke out in the Downtown and then spread to Eastside.
	Map of flu-related microblog messages on May 17 On May 19th, the disease had spread throughout the downstream of the Vast river.