Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link
Volume 22, Number 11—November 2016
Letter

Recent Chikungunya Virus Infection in 2 Travelers Returning from Mogadishu, Somalia, to Italy, 2016

On This Page
Tables
Article Metrics
8
citations of this article
EID Journal Metrics on Scopus

Cite This Article

To the Editor: Since chikungunya virus (CHIKV) was first isolated in 1952 (in Tanzania), outbreaks have occurred every 7–20 years in countries in Africa and Asia, and since 2013, it has been identified in the Americas (1,2). However, no cases have been reported from the Horn of Africa (3,4). We confirmed CHIKV infection acquired in 2016 by 2 travelers to Somalia who returned to Italy.

In June 2016, a Somali woman (patient 1) was referred to the Infectious and Tropical Diseases Unit, Careggi University Hospital, in Florence, Italy, because of severe diffuse bilateral arthralgia and edema in hands, wrists, ankles, and feet. Five days earlier, she had returned to Italy from Mogadishu, Somalia, where she had spent 45 days visiting relatives. The woman had been living in Italy since the 1990s and returned to Somalia each year for ≈2 months; she denied travel to other countries. She reported that symptoms started abruptly in May, 17 days after arriving in Somalia (28 days before returning to Italy). At symptom onset, arthralgia was associated with fever and skin rash, which lasted a few days.

In early July 2016, another Somali woman (patient 2) with bilateral arthralgia in her hands, wrists, ankles, and feet associated with foot edema sought medical care at the same hospital 7 days after returning from a 65-day trip to Mogadishu, where she visited relatives. The woman had been living in Italy ≈20 years; the only other travel she reported was to Kenya in 2012. Her symptoms started in June, 20 days after arriving in Somalia (45 days before returning to Italy). At symptom onset, she also had skin rash and fever, which lasted a few days.

Both patients reported that, during the same period, some of their relatives in Mogadishu had similar symptoms and were clinically diagnosed as having chikungunya fever by local doctors. Both also reported that, during the same period, other cases had been reported in Mogadishu by mass and social media and, thus, the local population was aware of the disease.

Serum samples for patients 1 and 2 were positive for CHIKV antibodies (Table). Both patients were treated with nonsteroidal antiinflammatory drugs and corticosteroids and are receiving follow-up.

According to the US Centers for Disease Control and Prevention, as of April 22, 2016, CHIKV had not been reported from Somalia (4), and no evidence exists for CHIKV circulation in that area of the Horn of Africa (3). In addition, on August 3, 2016, we performed a literature search in PubMed, Embase, and ProMED-mail, and found no reports of CHIKV in Somalia. Poorly documented preliminary data on the presence of CHIKV in Somalia were recently reported in 2 documents by the United Nations Office for the Coordination of Humanitarian Affairs. One document, dated June 7, 2016, stated “There are reports of an outbreak of the deadly Chikungunya virus in Banadir Region. According to WHO [the World Health Organization], 3 of 5 blood samples have tested positive” (reference 1 in Technical Appendix). The second document, dated June 30, 2016, stated that “some 11 suspected cases of Chikungunya were confirmed... in Mogadishu” (reference 2 in Technical Appendix). Several reports in the online press and social media have reported the current circulation of CHIKV in Somalia, including 2 Twitter posts (tweets) by the Ministry of Health of Kenya (references 3–7 in Technical Appendix). A Somali doctor living in Italy obtained confirmation of CHIKV circulation in Somalia by contacting colleagues at the Ministry of Health in Mogadishu (Omar Abdulcadir, Careggi University Hospital, pers. comm., 2016 Jul 19).

Direct and indirect evidence exists for the presence of competent CHIKV vectors (e.g., Aedes aegypti mosquitoes) in Somalia. Entomologic studies conducted in 1942 and 1969 confirmed the presence of A. aegypti mosquitoes in several cities along Somalia’s coast, including Mogadishu (5). Other arboviruses in which Aedes mosquitoes play a role as reservoir (Rift valley fever [RVF]) and vector (dengue and possibly RVF) have been reported in recent years in Somalia: RVF outbreaks occurred during 1997–1998 and 2006–2007 (6,7), and a dengue outbreak occurred during 1992–1993 (8).

The current outbreak in Somalia could have been triggered by several factors, including circulation of CHIKV in neighboring Kenya (references 8,9 in online Technical Appendix) and heavy rains that led to flooding in southern and central Somalia beginning in January 2016 (reference 1 in Technical Appendix). CHIKV has the potential to provoke explosive outbreaks in naive populations (9), so the current outbreak may greatly affect the economy and public health in Somalia.

Systematic studies to understand the magnitude of the ongoing epidemic are needed. In the meantime, local public health stakeholders in Somalia and healthcare workers worldwide caring for travelers returning from Somalia should be aware that CHIKV is circulating in the country. This report confirms the importance of travel medicine services in performing early diagnosis of imported arboviral diseases, not only to thwart secondary transmission during periods of competent vector activity but also to help to detect or confirm virus circulation in previously unaffected countries.

Top

Lorenzo Zammarchi, Claudia Fortuna, Giulietta Venturi, Francesca Rinaldi, Teresa Capobianco, Maria Elena Remoli, Gian Maria Rossolini, Giovanni Rezza, and Alessandro BartoloniComments to Author 
Author affiliations: Università Degli Studi di Firenze, Florence, Italy (L. Zammarchi, F. Rinaldi, G.M. Rossolini, A. Bartoloni); Azienda Ospedaliero-Universitaria Careggi, Florence (L. Zammarchi, T. Capobianco, G.M. Rossolini, A. Bartoloni); Istituto Superiore di Sanità, Rome, Italy (C. Fortuna, G. Venturi, M.E. Remoli, G. Rezza); Università di Siena, Siena, Italy (G.M. Rossolini); Fondazione IRCCS Don Carlo Gnocchi, Florence (G.M. Rossolini)

Top

References

  1. Madariaga  M, Ticona  E, Resurrecion  C. Chikungunya: bending over the Americas and the rest of the world. Braz J Infect Dis. 2016;20:918. DOIPubMedGoogle Scholar
  2. Magurano  F, Zammarchi  L, Baggieri  M, Fortuna  C, Farese  A, Benedetti  E, Chikungunya from the Caribbean: the importance of appropriate laboratory tests to confirm the diagnosis. Vector Borne Zoonotic Dis. 2015;15:25860. DOIPubMedGoogle Scholar
  3. Nsoesie  EO, Kraemer  MU, Golding  N, Pigott  DM, Brady  OJ, Moyes  CL, Global distribution and environmental suitability for chikungunya virus, 1952 to 2015. Euro Surveill. 2016;21: pii: 30234. PubMed
  4. Centers for Disease Control and Prevention. Chikungunya geographic distribution [cited 2016 Jul 12]. http://www.cdc.gov/chikungunya/geo/
  5. Mouchet  J. Aedes aegypti and potential vectors of yellow fever in the Democratic Republic of Somalia and in the French Territory of Afars and Issas [in French]. Bull World Health Organ. 1971;45:38394.PubMedGoogle Scholar
  6. World Health Organization. Rift Valley fever—East Africa, 1997–1998. MMWR Morb Mortal Wkly Rep. 1998;47:2614.PubMedGoogle Scholar
  7. World Health Organization. Outbreaks of Rift Valley fever in Kenya, Somalia and United Republic of Tanzania, December 2006–April 2007. Wkly Epidemiol Rec. 2007;82:16978.PubMedGoogle Scholar
  8. Kanesa-thasan  N, Chang  GJ, Smoak  BL, Magill  A, Burrous  MJ, Hoke  CH Jr. Molecular and epidemiologic analysis of dengue virus isolates from Somalia. Emerg Infect Dis. 1998;4:299303. DOIPubMedGoogle Scholar
  9. Cardona-Ospina  JA, Villamil-Gomez  WE, Jimenez-Canizales  CE, Castaneda-Hernandez  DM, Rodriguez-Morales  AJ. Estimating the burden of disease and the economic cost attributable to chikungunya, Colombia, 2014. Trans R Soc Trop Med Hyg. 2015;109:793802. DOIPubMedGoogle Scholar

Top

Table

Top

Cite This Article

DOI: 10.3201/eid2211.161225

Related Links

Top

Table of Contents – Volume 22, Number 11—November 2016

EID Search Options
presentation_01 Advanced Article Search – Search articles by author and/or keyword.
presentation_01 Articles by Country Search – Search articles by the topic country.
presentation_01 Article Type Search – Search articles by article type and issue.

Top

Comments

Please use the form below to submit correspondence to the authors or contact them at the following address:

Alessandro Bartoloni, Clinica Malattie Infettive, Dipartimento di Medicina Sperimentale e Clinica, Università Degli Studi di Firenze, Largo Brambilla 3, Florence, Italy

Send To

10000 character(s) remaining.

Top

Page created: October 19, 2016
Page updated: October 19, 2016
Page reviewed: October 19, 2016
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
file_external