Global & Disaster Medicine

MERS-CoV Transmission in an Extended Family, Saudi Arabia, 2014

CDC- Emerging Infectious Diseases

Abstract

“Risk factors for human-to-human transmission of…MERS-CoV are largely unknown. After MERS-CoV infections occurred in an extended family in Saudi Arabia in 2014, relatives were tested by using….rRT-PCR and serologic methods. Among 79 relatives, 19 (24%) were MERS-CoV positive; 11 were hospitalized, and 2 died. Eleven (58%) tested positive by rRT-PCR; 8 (42%) tested negative by rRT-PCR but positive by serology. Compared with MERS-CoV–negative adult relatives,

  • MERS-CoV–positive adult relatives were older and more likely to be male and to have chronic medical conditions.
  • Risk factors for household transmission included sleeping in an index patient’s room and touching respiratory secretions from an index patient.
  • Casual contact and simple proximity were not associated with transmission.
  • Serology was more sensitive than standard rRT-PCR for identifying infected relatives, highlighting the value of including serology in future investigations.”

Family relationships and household distribution of persons infected with MERS-CoV, Al-Qouz, Saudi Arabia, 2014. Black lines denote standard family tree relationships. Patients are lettered in order of symptom onset or, if asymptomatic, by test date. Green boxes indicate households; all persons living in households 1–4 were tested, except for 2 adults living in household 4 (not shown). Index patient (person with earliest symptom onset diagnosed by rRT-PCR) in each household is underlined. Uninfec


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