Varicella Fatality on a Cargo Vessel — Puerto Rico, 2015

Misty Ellis, MPH1; Carolina Luna-Pinto, MPH1; Thomas George, MPH1; Joanna J. Regan, MD1; Mona Marin, MD2; Adriana Lopez, MHS2; Brenda Rivera-Garcia, DVM3; Kara Tardivel, MD1 (View author affiliations)

View suggested citation
Article Metrics

Views equals page views plus PDF downloads

Related Materials

The U.S. Code of Federal Regulations (42 §71.21) requires that the master of a ship destined to a U.S. port of entry report certain illnesses, as well as any death onboard to the nearest CDC Quarantine Station (1). On December 30, 2015, the U.S. Coast Guard notified CDC of the death of a crew member of a foreign cargo vessel off the coast of Puerto Rico. Four days earlier, on December 26, the patient, a man aged 50 years from India, developed abdominal pain, headache, and fever (103.0°F [39.4°C]), followed by loose stools and pruritus. On December 28, a vesicular rash appeared on his face, neck, and shoulders. Medical consultants suspected varicella and recommended shipboard isolation. On December 29, the vesicles had begun to dry and scab, and he developed a nonproductive cough and reported chest congestion. On December 30, he had difficulty breathing and collapsed; cardiopulmonary resuscitation was unsuccessful. The Puerto Rico Department of Health was contacted to liaise with the medical examiner. Lung tissue and skin lesion specimens collected at autopsy were positive for varicella-zoster virus DNA by polymerase chain reaction at CDC. The cause of death was reported as varicella pneumonia. No other medical conditions were reported.

Per CDC recommendations, all 24 shipmates were considered contacts of the index patient; the master of the ship instituted daily temperature and rash surveillance for 21 days (i.e., one incubation period) after the death. On days 13 and 16 of surveillance, two crew members were sent home because of emergencies unrelated to varicella. San Juan and Houston CDC Quarantine Stations coordinated varicella vaccination for the 22 remaining and five new crew members boarding after the end of the 21-day surveillance, all of whom had unknown varicella immunity. Acyclovir was procured by the ship for treatment of possible additional cases; however, none occurred.

Varicella, a highly contagious disease caused by the varicella-zoster virus, is transmitted by direct contact with vesicle fluid, or through breathing infectious droplets. Varicella is typically a mild disease; however, adults are at risk for more severe illness and have a higher incidence of complications, most commonly pneumonia (2). Adults who grew up in tropical countries or countries where varicella vaccination is uncommon might have increased varicella susceptibility (3). Varicella rarely results in death; mortality rates during 1990–1994 (before vaccine licensure) were 0.3 per 1,000,000 population among persons aged ≥20 years. Pneumonia was the most common cause of death in previously healthy persons with varicella in this age group (4). Before effective chemotherapy, a case fatality rate of 10%–30% was reported among adults with varicella pneumonia (5).

This investigation highlights the importance of early notification of illness or death to CDC by ships arriving to U.S. ports of entry, and the use of CDC’s varicella management guidance to prevent further transmission (6), including surveillance for febrile rash illness, isolation of cases, screening for varicella immunity, and vaccination of nonimmune persons. Collaboration with the U.S. Coast Guard was critical for expediting communication with the master of the ship. Assistance from the Puerto Rico Department of Health and the Puerto Rico Forensic Sciences Institute was instrumental in ensuring a thorough and timely investigation and public health response. Keeping a stock of acyclovir onboard was added to the CDC maritime varicella management guidance (6).


United States Coast Guard Sector San Juan, Puerto Rico; Captain Arvinderjit Keith, Marine Superintendent, Captain Satish Malla, Master of the Ship, AET Ship Management; Dengue Branch, Division of Vector-Borne Diseases; CDC; CDC San Juan Quarantine Station; CDC Houston Quarantine Station; Michelle Decenteceo, CDC Miami Quarantine Station; Daniel Lopez, MD, Puerto Rico Institute of Forensic Science; Julio L. Cádiz-Velázquez, MD, Puerto Rico Department of Health.

Corresponding author: Misty Ellis,; 787-253-7880.

1Division of Global Migration and Quarantine, National Center for Emerging and Zoonotic Diseases, CDC; 2Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, CDC; 3Puerto Rico Department of Health, Epidemiology.


  1. Radio Report of Death or Illness, 42 C.F.R. Sect. 71.21 (2015).
  2. Choo PW, Donahue JG, Manson JE, Platt R. The epidemiology of varicella and its complications. J Infect Dis 1995;172:706–12. CrossRef PubMed
  3. Sengupta N, Breuer J. A global perspective of the epidemiology and burden of varicella-zoster virus. Curr Pediatr Rev 2009;5:207–28. . CrossRef
  4. Meyer PA, Seward JF, Jumaan AO, Wharton M. Varicella mortality: trends before vaccine licensure in the United States, 1970-1994. J Infect Dis 2000;182:383–90. CrossRef PubMed
  5. Triebwasser JH, Harris RE, Bryant RE, Rhoades ER. Varicella pneumonia in adults. Report of seven cases and a review of literature. Medicine (Baltimore) 1967;46:409–23. CrossRef PubMed
  6. CDC. Cargo ships: reporting maritime death or illness to DGMQ. Atlanta, GA: US Department Health and Human Services, CDC; 2017.

Suggested citation for this article: Ellis M, Luna-Pinto C, George T, et al. Notes from the Field. Varicella Fatality on a Cargo Vessel — Puerto Rico, 2015. MMWR Morb Mortal Wkly Rep 2017;66:410. DOI:

MMWR and Morbidity and Mortality Weekly Report are service marks of the U.S. Department of Health and Human Services.
Use of trade names and commercial sources is for identification only and does not imply endorsement by the U.S. Department of Health and Human Services.
References to non-CDC sites on the Internet are provided as a service to MMWR readers and do not constitute or imply endorsement of these organizations or their programs by CDC or the U.S. Department of Health and Human Services. CDC is not responsible for the content of pages found at these sites. URL addresses listed in MMWR were current as of the date of publication.

All HTML versions of MMWR articles are generated from final proofs through an automated process. This conversion might result in character translation or format errors in the HTML version. Users are referred to the electronic PDF version ( and/or the original MMWR paper copy for printable versions of official text, figures, and tables.

Questions or messages regarding errors in formatting should be addressed to

View Page In: PDF [94K]