Mumps Resurgence at a Large University Campus Town Awais Vaid, MBBS, MPH Epidemiologist and Director of Planning Champaign-Urbana Public Health District.

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Presentation transcript:

Mumps Resurgence at a Large University Campus Town Awais Vaid, MBBS, MPH Epidemiologist and Director of Planning Champaign-Urbana Public Health District NCICP Conference May 25-27, 2016

Mumps Virus Mumps is an acute viral disease characterized by fever and swelling of the parotid or other salivary glands Mumps is caused by the mumps virus (MuV), a member of the Paramyxoviridae family of enveloped, non-segmented, negative-sense RNA viruses. Mumps is characterized by painful inflammatory symptoms, such as parotitis and orchitis. The virus is highly neurotropic, with laboratory evidence of central nervous system (CNS) infection in approximately half of cases. Symptomatic CNS infection occurs less frequently.

Mumps Vaccine The mumps vaccine was introduced in 1967, and the disease became nationally reportable in The incidence has decreased substantially with vaccination, but periods of resurgence have occurred in recent years. [1] One dose of mumps or MMR vaccine is 78% (49% to 92%) effective. Two dose mumps vaccine effectiveness is 88% (66% to 95%).

Cases in US

Recent Mumps Outbreaks In 2006, a multi-state mumps outbreak involving more than 6,500 reported cases. This resurgence predominantly affected college-aged students living in the Midwest. In 2009 to 2010, two large outbreaks occurred. One multi-year outbreak involved about 3,000 people religious community in New York City and attended schools in which they had very close contact. The outbreak started when an infected student in this religious community returned from the United Kingdom where a large mumps outbreak was occurring. In , there were several smaller mumps outbreaks reported on college campuses in California, Virginia, and Maryland

Timeline of Champaign County Mumps Outbreak On April 15, 2015, the university health center reported a male aged 21 years with symptoms of fever and parotitis beginning April 9. In the following two weeks, five additional suspect mumps cases were identified. On May 1, a seventh suspect mumps case was confirmed by polymerase chain reaction (PCR). The six previous suspect cases were epidemiologically linked to the confirmed case, establishing a mumps outbreak at the university.

Timeline Continued Probable and confirmed cases were identified using the standard case definition for mumps Cases were considered infectious from two days before onset of parotitis to five days after. The exposure period was defined as 12 to 25 days prior to onset of parotitis. Outbreak control measures recommended to the university health center included standard and droplet precautions for patients in health care facilities, isolation of ill individuals during their infectious period, and exclusion of susceptible contacts from public settings from 12 to 25 days after exposure.

3 rd Dose Recommendation By July 31, 75 cases had been reported. Because of increasing case counts during the summer semester despite high 2-dose MMR vaccination coverage, on August 4, we issued a recommendation for all students and staff born after 1956 to receive an additional dose of MMR vaccine before a large number of students returned to campus for the fall semester. Notifications were sent to students and their families to inform them of the current recommendation and an Epi-X notification was posted to inform state health agencies of the recommendation. An estimated 50,000 students and staff were targeted for this intervention.

Mass Vaccination Clinics Five vaccination clinics were held on the university campus during August 6-27, and C-UPHD and the university health center administered MMR vaccine through the fall semester. If off-campus for the summer, students were encouraged to receive vaccine from their health care provider or pharmacy before returning to school. A total of 11,199 doses of MMR vaccine were administered from August 4 to October 1

Justification for 3 rd Dose MMR As in many previously described mumps outbreaks, this outbreak demonstrated sustained transmission of mumps despite high 2-dose MMR vaccination coverage. Although no formal recommendation is in place for using a third dose of MMR vaccine as a control measure during mumps outbreaks, CDC has provided guidelines for agencies considering its use. Factors that might trigger recommending a third dose include outbreaks among populations with 2-dose MMR vaccination coverage of >90%, intense exposure settings like universities, evidence of sustained transmission for >2 weeks, and high attack rates All but the latter were considered when recommending the dose during this outbreak

Justification for 3 rd Dose MMR Three key aspects of this outbreak contributed to the recommendation of a third dose of MMR vaccine. 1.This outbreak did not follow typical seasonal trends for mumps in Illinois. 2.The expectation of a large increase in the number of students returning to the university campus at the start of the fall semester, increasing the population density on campus and adding an unknown number of susceptible individuals to the population. 3.evidence of sustained transmission despite high vaccination coverage among university students

Trend of Confirmed and Probable cases by month

Vaccination Rates of Cases Vaccine DoseMumps CasesPercentage % % % 0 or Unknown % Sum:302

Vaccination Status of Cases Vaccine StatusMumps CasesPercentage No72.32% Unknown144.64% Yes % Sum:302

Transmission Setting of Cases Transmission Setting Case CountPercentage College % Home72.32% Other103.31% School % Unknown72.32% Work61.99% Sum: %

Demographic Profile of Cases Mumps by GenderMumps CasesPercentage Female % Male % Unknown154.97% Sum:302

Epidemiology of Case Status Case StatusMumps CasesPercentage Confirmed % Probable % Sum:302

Set up of Mass Vaccination Clinics at the UIUC Campus Recreation Center

Federal Vaccine supplies

Current Status& Cost We are currently at 320+ cases We continue to see 4-5 cases each week. With the University closed after graduation on May 15 th, we are hoping that cases will slow down enough to break the chain of transmission. Approximate cost of the entire outbreak management was in excess of $ 1 Million.

Questions? Awais Vaid