Giardia Lamblia in Michigan, 1980
Boekeloo, Bradley O.
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Due to noted concern in other states, this Giardia lamblia surveillance project was suggested by the Mihigan Department of Public Health (MDPH), Division of Disease Control. Giardiasis is presently not a reportable illness, but it will be if the Michigan legislature passes a revision of the public health code on communicable disease control in the fall of 1981. A follow-up investigation of MDPH Giardia isolations during the time period May 1, 1980 thru January 31, 1981 identified 45 individuals ill with giardiasis. Symptoms included loose stools, extreme weakness, foul smelling stools, gas, unintentional weight loss, abdominal cramps and bloating. The mean duration of illness was six weeks. The number of infections reported was greatest in the summer and fall months, which would correlate with increased outdoor activity. Several likely sources of infection in Michigan were identified and included babies' diapers, other ill persons with diarrhea, and surface water. Giardiasis was found to be endemic in Michigan with no major common source outbreaks recorded. Mandatory reporting of the disease would increase the ability for surveillance of sources of infection to allow preventative measures against outbreaks. Adequate reporting would require case histories.