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Medscape CME Activity

Medscape, LLC is pleased to provide online continuing medical education (CME) for selected journal articles, allowing clinicians the opportunity to earn Medscape CME credit. Medscape, LLC is accredited by the Accreditation Council for Continuing Medical Education (ACCME) to provide Medscape CME for physicians. The activities listed below have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education through the joint sponsorship of Medscape, LLC and Emerging Infectious Diseases. Medscape, LLC is accredited by the ACCME to provide continuing medical education for physicians.

Volume 22—2016

Volume 22, Number 7—July 2016

Medscape CME Activity
Pregnancy, Labor, and Delivery after Ebola Virus Disease and Implications for Infection Control in Obstetric Services, United States
A. Kamali et al.
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Women who become pregnant after recovery pose little risk for transmitting the virus to the baby or others.

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Many of the survivors of the 2014–2015 epidemic of Ebola virus disease (EVD) in West Africa were women of childbearing age. Limited clinical and laboratory data exist that describe these women’s pregnancies and outcomes. We report the case of an EVD survivor who became pregnant and delivered her child in the United States, and we discuss implications of this case for infection control practices in obstetric services. Hospitals in the United States must be prepared to care for EVD survivors.

Volume 22, Number 6—June 2016

image of the 'Thumbnail' version of the Volume 22, Number 6—June 2016 cover of the CDC's EID journal
Medscape CME Activity
Infectious Disease Risk Associated with Contaminated Propofol Anesthesia, 1989–2014 PDF Version [PDF - 1.14 MB - 12 pages]
A. Zorrilla-Vaca et al.
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Transmission of illness to 144 patients, resulting in 10 deaths, has been linked to extrinsic contamination.

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Administration of propofol, the most frequently used intravenous anesthetic worldwide, has been associated with several iatrogenic infections despite its relative safety. Little is known regarding the global epidemiology of propofol-related outbreaks and the effectiveness of existing preventive strategies. In this overview of the evidence of propofol as a source of infection and appraisal of preventive strategies, we identified 58 studies through a literature search in PubMed, Embase, and Lilacs for propofol-related infections during 1989–2014. Twenty propofol-related outbreaks have been reported, affecting 144 patients and resulting in 10 deaths. Related factors included reuse of syringes for multiple patients and prolonged exposure to the environment when vials were left open. The addition of antimicrobial drugs to the emulsion has been instituted in some countries, but outbreaks have still occurred. There remains a lack of comprehensive information on the effectiveness of measures to prevent future outbreaks.

Medscape CME Activity
Human Infection with Influenza A(H7N9) Virus during 3 Major Epidemic Waves, China, 2013–2015
P. Wu et al.
View Summary

Variation in risk for death might be associated with differences in case ascertainment, changes in clinical management, or virus genetic diversity.

   View Abstract

Since March 2013, a novel influenza A(H7N9) virus has caused 3 epidemic waves of human infection in mainland China. We analyzed data from patients with laboratory-confirmed influenza A(H7N9) virus infection to estimate the risks for severe outcomes after hospitalization across the 3 waves. We found that hospitalized patients with confirmed infections in waves 2 and 3 were younger and more likely to be residing in small cities and rural areas than were patients in wave 1; they also had a higher risk for death, after adjustment for age and underlying medical conditions. Risk for death among hospitalized patients during waves 2 and 3 was lower in Jiangxi and Fujian Provinces than in eastern and southern provinces. The variation in risk for death among hospitalized case-patients in different areas across 3 epidemic waves might be associated with differences in case ascertainment, changes in clinical management, or virus genetic diversity.

Volume 22, Number 5—May 2016

image of the 'Thumbnail' version of the Volume 22, Number 5—May 2016 cover of the CDC's EID journal
Medscape CME Activity
Rickettsia parkeri Rickettsiosis, Arizona, USA PDF Version [PDF - 483 KB - 6 pages]
K. L. Herrick et al.
View Summary

The likely vector was Amblyomma triste, a Neotropical tick species only recently recognized in the United States.

   View Abstract

In the United States, all previously reported cases of Rickettsia parkeri rickettsiosis have been linked to transmission by the Gulf Coast tick (Amblyomma maculatum). Here we describe 1 confirmed and 1 probable case of R. parkeri rickettsiosis acquired in a mountainous region of southern Arizona, well beyond the recognized geographic range of A. maculatum ticks. The likely vector for these 2 infections was identified as the Amblyomma triste tick, a Neotropical species only recently recognized in the United States. Identification of R. parkeri rickettsiosis in southern Arizona demonstrates a need for local ecologic and epidemiologic assessments to better understand geographic distribution and define public health risk. Education and outreach aimed at persons recreating or working in this region of southern Arizona would improve awareness and promote prevention of tickborne rickettsioses.

Medscape CME Activity
Spectrum of Viral Pathogens in Blood of Returned, Malaria-Free, Ill Travelers from Canada PDF Version [PDF - 453 KB - 8 pages]
R. Kariyawasam et al.
View Summary

Over a 2-year period, common and emerging viruses were documented in >20% of these travelers.

Volume 22, Number 4—April 2016

image of the 'Thumbnail' version of the Volume 22, Number 4—April 2016 cover of the CDC's EID journal
Medscape CME Activity
Shiga Toxin 1–Producing Shigella sonnei Infections, California, United States, 2014–2015 PDF Version [PDF - 558 KB - 8 pages]
K. Lamba et al.
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Initially transmitted among persons traveling to the US from Mexico, the bacteria was domestically transmitted to 42 of 56 case-patients.

   View Abstract

Shiga toxins (Stx) are primarily associated with Shiga toxin–producing Escherichia coli and Shigella dysenteriae serotype 1. Stx production by other shigellae is uncommon, but in 2014, Stx1-producing S. sonnei infections were detected in California. Surveillance was enhanced to test S. sonnei isolates for the presence and expression of stx genes, perform DNA subtyping, describe clinical and epidemiologic characteristics of case-patients, and investigate for sources of infection. During June 2014–April 2015, we identified 56 cases of Stx1-producing S. sonnei, in 2 clusters. All isolates encoded stx1 and produced active Stx1. Multiple pulsed-field gel electrophoresis patterns were identified. Bloody diarrhea was reported by 71% of case-patients; none had hemolytic uremic syndrome. Some initial cases were epidemiologically linked to travel to Mexico, but subsequent infections were transmitted domestically. Continued surveillance of Stx1-producing S. sonnei in California is necessary to characterize its features and plan for reduction of its spread in the United States.

Volume 22, Number 3—March 2016

image of the 'Thumbnail' version of the Volume 22, Number 3—March 2016 cover of the CDC's EID journal
Medscape CME Activity
Tuberculosis Caused by Mycobacterium africanum, United States, 2004–2013 PDF Version [PDF - 618 KB - 8 pages]
A. Sharma et al.
View Summary

Routine reporting of TB caused by this organism does not appear warranted at this time.

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Mycobacterium africanum is endemic to West Africa and causes tuberculosis (TB). We reviewed reported cases of TB in the United States during 2004–2013 that had lineage assigned by genotype (spoligotype and mycobacterial interspersed repetitive unit variable number tandem repeats). M. africanum caused 315 (0.4%) of 73,290 TB cases with lineage assigned by genotype. TB caused by M. africanum was associated more with persons from West Africa (adjusted odds ratio [aOR] 253.8, 95% CI 59.9–1,076.1) and US-born black persons (aOR 5.7, 95% CI 1.2–25.9) than with US-born white persons. TB caused by M. africanum did not show differences in clinical characteristics when compared with TB caused by M. tuberculosis. Clustered cases defined as >2 cases in a county with identical 24-locus mycobacterial interspersed repetitive unit genotypes, were less likely for M. africanum (aOR 0.1, 95% CI 0.1–0.4), which suggests that M. africanum is not commonly transmitted in the United States.

Medscape CME Activity
Epidemiology of Histoplasmosis Outbreaks, United States, 1938–2013 PDF Version [PDF - 702 KB - 9 pages]
K. Benedict and R. K. Mody
View Summary

Continued occurrence, particularly in work-related settings, highlights the need to increase awareness of this disease.

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Histoplasmosis has been described as the most common endemic mycosis in the United States. However, histoplasmosis is not nationally notifiable. Its presumed geographic distribution is largely derived from skin test surveys performed during the 1940s, and information about its local features comes primarily from outbreak investigations. We conducted a literature review to assess epidemiologic features of histoplasmosis outbreaks in the United States. During 1938–2013, a total of 105 outbreaks involving 2,850 cases were reported in 26 states and the territory of Puerto Rico. Common exposure settings were chicken coops and buildings or other structures undergoing renovation or demolition. Birds, bats, or their droppings were reported to be present in 77% of outbreak settings, and workplace exposures were reported in 41% of outbreaks. The continued occurrence of histoplasmosis outbreaks, particularly work-related ones involving known disturbance of bird or bat droppings, highlights the need to increase awareness of the disease.

Medscape CME Activity
Patient Report and Review of Rapidly Growing Mycobacterial Infection after Cardiac Device Implantation PDF Version [PDF - 541 KB - 7 pages]
V. K. Phadke et al.
View Summary

As more of these devices are implanted, such infections are likely to be more frequently reported.

   View Abstract

Mycobacterial infections resulting from cardiac implantable electronic devices are rare, but as more devices are implanted, these organisms are increasingly emerging as causes of early-onset infections. We report a patient with an implantable cardioverter-defibrillator pocket and associated bloodstream infection caused by an organism of the Mycobacterium fortuitum group, and we review the literature regarding mycobacterial infections resulting from cardiac device implantations. Thirty-two such infections have been previously described; most (70%) were caused by rapidly growing species, of which M. fortuitum group species were predominant. When managing such infections, clinicians should consider the potential need for extended incubation of routine cultures or dedicated mycobacterial cultures for accurate diagnosis; combination antimicrobial drug therapy, even for isolates that appear to be macrolide susceptible, because of the potential for inducible resistance to this drug class; and the arrhythmogenicity of the antimicrobial drugs traditionally recommended for infections caused by these organisms.

Volume 22, Number 2—February 2016

image of the 'Thumbnail' version of the Volume 22, Number 2—February 2016 cover of the CDC's EID journal
Medscape CME Activity
Sustained Transmission of Pertussis in Vaccinated, 1–5-Year-Old Children in a Preschool, Florida, USA PDF Version [PDF - 496 KB - 5 pages]
J. Matthias et al.
View Summary

Monitoring of vaccine performance is necessary to identify outbreaks or emerging epidemiologic trends.

   View Abstract

In September 2013, local county health officials in Tallahassee, Florida, USA, were notified of a laboratory-confirmed pertussis case in a 1-year-old preschool attendee. During a 5-month period, 26 (22%) students 1–5 years of age, 2 staff from the same preschool, and 11 family members met the national case definition for pertussis. Four persons during this outbreak were hospitalized for clinical management of pertussis symptoms. Only 5 students, including 2 students with pertussis, had not received the complete series of vaccinations for pertussis. Attack rates in 1 classroom for all students who received the complete series of vaccinations for pertussis approached 50%. This outbreak raises concerns about vaccine effectiveness in this preschool age group and reinforces the idea that recent pertussis vaccination should not dissuade physicians from diagnosing, testing, or treating persons with compatible illness for pertussis.

Medscape CME Activity
Molecular Characterization of Invasive Streptococcus dysgalactiae subsp. equisimilis, Japan PDF Version [PDF - 606 KB - 8 pages]
T. Wajima et al.
View Summary

This infection is an increasing threat to aging populations.

   View Abstract

We collected β-hemolytic streptococci (1,611 isolates) from patients with invasive streptococcal infections in Japan during April 2010–March 2013. Streptococcus dysgalactiae subsp. equisimilis (SDSE) was most common (n = 693); 99% of patients with SDSE infections were elderly (mean age 75 years, SD ±15 years). We aimed to clarify molecular and epidemiologic characteristics of SDSE isolates and features of patient infections. Bacteremia with no identified focus of origin and cellulitis were the most prevalent manifestations; otherwise, clinical manifestations resembled those of S. pyogenes infections. Clinical manifestations also differed by patient’s age. SDSE isolates were classified into 34 emm types; stG6792 was most prevalent (27.1%), followed by stG485 and stG245. Mortality rates did not differ according to emm types. Multilocus sequence typing identified 46 sequence types and 12 novel types. Types possessing macrolide- and quinolone-resistance genes were 18.4% and 2.6%, respectively; none showed β-lactam resistance. Among aging populations, invasive SDSE infections are an increasing risk.

Volume 22, Number 1—January 2016

image of the 'Thumbnail' version of the Volume 22, Number 1—January 2016 cover of the CDC's EID journal
Medscape CME Activity
Epidemiology of Haemophilus ducreyi Infections PDF Version [PDF - 1.12 MB - 8 pages]
C. González-Beiras et al.
View Summary

Infections are at their lowest level worldwide, but nongenital cutaneous infections have increased.

   View Abstract

The global epidemiology of Haemophilus ducreyi infections is poorly documented because of difficulties in confirming microbiological diagnoses. We evaluated published data on the proportion of genital and nongenital skin ulcers caused by H. ducreyi before and after introduction of syndromic management for genital ulcer disease (GUD). Before 2000, the proportion of GUD caused by H. ducreyi ranged from 0.0% to 69.0% (35 studies in 25 countries). After 2000, the proportion ranged from 0.0% to 15.0% (14 studies in 13 countries). In contrast, H. ducreyi has been recently identified as a causative agent of skin ulcers in children in the tropical regions; proportions ranged from 9.0% to 60.0% (6 studies in 4 countries). We conclude that, although there has been a sustained reduction in the proportion of GUD caused by H. ducreyi, this bacterium is increasingly recognized as a major cause of nongenital cutaneous ulcers.

Medscape CME Activity
Falling Plasmodium knowlesi Malaria Death Rate among Adults despite Rising Incidence, Sabah, Malaysia, 2010–2014 PDF Version [PDF - 857 KB - 8 pages]
G. S. Rajahram et al.
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The decreased notification-fatality rate is likely associated with improved use of intravenous artesunate for severe malaria.

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Deaths from Plasmodium knowlesi malaria have been linked to delayed parenteral treatment. In Malaysia, early intravenous artesunate is now recommended for all severe malaria cases. We describe P. knowlesi fatalities in Sabah, Malaysia, during 2012–2014 and report species-specific fatality rates based on 2010–2014 case notifications. Sixteen malaria-associated deaths (caused by PCR-confirmed P. knowlesi [7], P. falciparum [7], and P. vivax [1] and microscopy-diagnosed “P. malariae” [1]) were reported during 2012–2014. Six patients with severe P. knowlesi malaria received intravenous artesunate at hospital admission. For persons >15 years of age, overall fatality rates during 2010–2014 were 3.4, 4.2, and 1.0 deaths/1,000 P. knowlesi, P. falciparum, and P. vivax notifications, respectively; P. knowlesi–associated fatality rates fell from 9.2 to1.6 deaths/1,000 notifications. No P. knowlesi–associated deaths occurred among children, despite 373 notified cases. Although P. knowlesi malaria incidence is rising, the notification-fatality rate has decreased, likely due to improved use of intravenous artesunate.

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