1 9 Lyme Disease Lyme disease is caused by a bacteria called Borrelia burgdorferi and is spread through the bite of an infected black legged tick generally found in woods and grassy areas There were 213 515 confirmed cases reported to the Centers for Disease Control CDC between 2001 and 2010 and these are bro ken down by age and sex in Figure 1 9 Cases 25 000 20 000 15 000 10 000 5 000 0 Confirmed Lyme disease cases by age and sex United States 2001 10 Male Female 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Age years Reported cases of Lyme disease are most common among boys aged 5 9 Here is how Figure 1 9 relates to what we have been studying The in als are the 213 515 people with confirmed cases and two of the variab sured on each individual are sex and age Considering males and fema rately we could draw a histogram of the variable age using class inter 5 years old 5 to 10 years old and so forth Look at the leftmost in Figure 1 9 The light blue bar shows that approximately 9000 of s were between 0 and 5 years old and the dark blue bar shows slightly few les were in this age range If we were to take all the light blue bars and side by side we would have the histogram of age for males using the cl als stated Similarly the dark blue bars show females Because we are display both histograms in the same graph the bars for males and fema 1