Archive for April 17, 2016

Diagnostic Options and Challenges for Dengue and Chikungunya Viruses.

Biomed Res Int. 2015;2015:834371.

Mardekian SK1, Roberts AL1.

Author information

1Sidney Kimmel Medical College at Thomas Jefferson University, 117 South 11th Street, PAV 207, Philadelphia, PA 19107, USA.

Abstract

Dengue virus (DENV) and Chikungunya virus (CHIKV) are arboviruses that share the same Aedes mosquito vectors and thus overlap in their endemic areas.

These two viruses also cause similar clinical presentations, especially in the initial stages of infection, with neither virus possessing any specific distinguishing clinical features.

Because the outcomes and management strategies for these two viruses are vastly different, early and accurate diagnosis is imperative. Diagnosis is also important for surveillance, outbreak control, and research related to vaccine and drug development.

Available diagnostic tests are aimed at detection of the virus, its antigenic components, or the host immune antibody response. In this review, we describe the recent progress and continued challenges related to the diagnosis of DENV and CHIKV infections.

PDF

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4609775/pdf/BMRI2015-834371.pdf

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April 17, 2016 at 11:16 am

Chikungunya: epidemiology.

F1000Res. 2016 Jan 19;5. pii: F1000 Faculty Rev-82.

Petersen LR1, Powers AM1.

Author information

1Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO, USA.

Abstract

Chikungunya virus is a mosquito-borne alphavirus that causes fever and debilitating joint pains in humans. Joint pains may last months or years.

It is vectored primarily by the tropical and sub-tropical mosquito, Aedes aegypti, but is also found to be transmitted by Aedes albopictus, a mosquito species that can also be found in more temperate climates.

In recent years, the virus has risen from relative obscurity to become a global public health menace affecting millions of persons throughout the tropical and sub-tropical world and, as such, has also become a frequent cause of travel-associated febrile illness. In this review, we discuss our current understanding of the biological and sociological underpinnings of its emergence and its future global outlook.

PDF

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4754000/pdf/f1000research-5-7727.pdf

April 17, 2016 at 11:15 am

Zika Virus.

Clin Microbiol Rev. 2016 July V.29 N.3 P.487-524.

Musso D1, Gubler DJ2.

Author information

1Unit of Emerging Infectious Diseases, Institut Louis Malardé, Tahiti, French Polynesia dmusso@ilm.pf duane.gubler@duke-nus.edu.sg

2Program in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore Partnership for Dengue Control, Lyon, France dmusso@ilm.pf  duane.gubler@duke-nus.edu.sg

Abstract

Zika virus (ZIKV) is an arthropod-borne virus (arbovirus) in the genus Flavivirus and the family Flaviviridae. ZIKV was first isolated from a nonhuman primate in 1947 and from mosquitoes in 1948 in Africa, and ZIKV infections in humans were sporadic for half a century before emerging in the Pacific and the Americas.

ZIKV is usually transmitted by the bite of infected mosquitoes. The clinical presentation of Zika fever is nonspecific and can be misdiagnosed as other infectious diseases, especially those due to arboviruses such as dengue and chikungunya.

ZIKV infection was associated with only mild illness prior to the large French Polynesian outbreak in 2013 and 2014, when severe neurological complications were reported, and the emergence in Brazil of a dramatic increase in severe congenital malformations (microcephaly) suspected to be associated with ZIKV. Laboratory diagnosis of Zika fever relies on virus isolation or detection of ZIKV-specific RNA. Serological diagnosis is complicated by cross-reactivity among members of the Flavivirus genus.

The adaptation of ZIKV to an urban cycle involving humans and domestic mosquito vectors in tropical areas where dengue is endemic suggests that the incidence of ZIKV infections may be underestimated.

There is a high potential for ZIKV emergence in urban centers in the tropics that are infested with competent mosquito vectors such as Aedes aegypti and Aedes albopictus.

PDF

http://cmr.asm.org/content/29/3/487.full.pdf

April 17, 2016 at 11:13 am

High Incidence of Chikungunya Virus and Frequency of Viremic Blood Donations during Epidemic, Puerto Rico, USA, 2014

Emerging Infectious Diseases July 2016 V.22 N.7

Graham Simmons, Vanessa Brès, Kai Lu, Nathan M. Liss, Donald J. Brambilla, Kyle R. Ryff, Roberta Bruhn, Edwin Velez, Derrek Ocampo, Jeffrey M. Linnen, Gerardo Latoni, Lyle R. Petersen, Phillip C. Williamson, and Michael P. Busch

Author affiliations: Blood Systems Research Institute, San Francisco, California, USA (G. Simmons, K. Lu, N.M. Liss, R. Bruhn, M.P. Busch); University of California, San Francisco (G. Simmons, M.P. Busch); Hologic, Inc., San Diego, California, USA (V. Brès, D. Ocampo, J.M. Linnen); RTI International, Rockville, Maryland, USA (D.J. Brambilla); Puerto Rico Department of Health, San Juan, Puerto Rico, USA (K.R. Ryff); Banco de Sangre de Servicios Mutuos, San Juan, Puerto Rico, USA (E. Velez, G. Latoni); Centers for Disease Control and Prevention, Fort Collins, Colorado, USA (L.R. Petersen); Creative Testing Solutions, Tempe, Arizona, USA (P.C. Williamson)

Chikungunya virus (CHIKV) caused large epidemics throughout the Caribbean in 2014. We conducted nucleic acid amplification testing (NAAT) for CHIKV RNA (n = 29,695) and serologic testing for IgG against CHIKV (n = 1,232) in archived blood donor samples collected during and after an epidemic in Puerto Rico in 2014. NAAT yields peaked in October with 2.1% of donations positive for CHIKV RNA.

A total of 14% of NAAT-reactive donations posed a high risk for virus transmission by transfusion because of high virus RNA copy numbers (104–109 RNA copies/mL) and a lack of specific IgM and IgG responses.

Testing of minipools of 16 donations would not have detected 62.5% of RNA-positive donations detectable by individual donor testing, including individual donations without IgM and IgG.

Serosurveys before and after the epidemic demonstrated that nearly 25% of blood donors in Puerto Rico acquired CHIKV infections and seroconverted during the epidemic.

FULL TEXT

http://wwwnc.cdc.gov/eid/article/22/7/16-0116_article

 

April 17, 2016 at 11:12 am

Technological Solutions to Address Drug-Resistant Neisseria gonorrhoeae

Emerging Infectious Diseases May 2016 V.22 N.5

Letter

To the Editor: Since the 1930s, Neisseria gonorrhoeae has become resistant to drugs in every class of antimicrobial therapy used to treat it. We read with interest the article by Martin et al. about trends in Canada on N. gonorrhoeae susceptibility to third-generation cephalosporins, the only class of antimicrobial drugs to which most N. gonorrhoeae strains remain susceptible (1). We find the reported decrease in cefixime- and ceftriaxone-reduced susceptibility during 2010–2014 encouraging, but remain concerned about a threat from drug-resistant and untreatable N. gonorrhoeae infections: a similar downward trend in the United States reversed in 2014 (2). That divergence demonstrates the limited reliability of surveillance data…..

PDF

http://wwwnc.cdc.gov/eid/article/22/5/pdfs/16-0083.pdf

April 17, 2016 at 11:09 am

Fatal Septicemia Linked to Transmission of MRSA Clonal Complex 398 in Hospital and Nursing Home, Denmark

Emerging Infectious Diseases May 2016 V.22 N.5

Rikke Thoft Nielsen, Michael Kemp, Anette Holm, Marianne Nielsine Skov, Mette Detlefsen, Henrik Hasman, Frank Møller Aarestrup, Rolf Sommer Kaas, Jesper Boye Nielsen, Henrik Westh, and Hans Jørn Kolmos

Author affiliations: Author affiliations: Odense University Hospital, Odense, Denmark (R.T. Nielsen, M. Kemp, A. Holm, M.N. Skov, M. Detlefsen, H.J. Kolmos); Denmark Technical University National Food Institute, Kongens Lyngby, Denmark (H. Hasman, F.M. Aarestrup, R.S. Kaas); Hvidovre University Hospital, Hvidovre, Denmark (J.B. Nielsen, H. Westh)

We describe 2 fatal cases of methicillin-resistant Staphylococcus aureus (MRSA) clonal complex 398 septicemia in persons who had no contact with livestock.

Whole-genome sequencing of the isolated MRSA strains strongly suggest that both were of animal origin and that the patients had been infected through 2 independent person-to-person transmission chains.

PDF

http://wwwnc.cdc.gov/eid/article/22/5/pdfs/15-1835.pdf

April 17, 2016 at 11:08 am


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