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<recommendedContent xmlns="http://api.mspoke.com">
    <recommendedItem id="20100101_19_432"
                     title="Short Needle May Short HBV Protection for Obese (CME/CE)"
                     score="0.012"
                     href="http://www.medpagetoday.com/Pediatrics/Vaccines/tb/18348?impressionId=1265798793483"
                     
      &lt;p&gt;Obese adolescents and young adults may not generate an adequate immune response to hepatitis B (HBV) vaccine because the needles used to vaccinate them are too short, a randomized study suggests.&lt;/p&gt;
&lt;p&gt;Immunization with a 1.5-inch needle was associated with 80% higher anti-HBV titers than a 1.0-inch needle, researchers reported online in &lt;em&gt;Pediatrics.&lt;/em&gt;&lt;/p&gt;
&lt;p&gt;The difference persisted in analyses performed to correct for imbalances in the study population.&lt;/p&gt;
&lt;p&gt;&quot;This supports the hypothesis that inadequate muscle penetration is responsible, at least in part, for lower immune response to HBV vaccine among obese adolescent and adult vaccine recipients,&quot; Amy Middleman, MD, of Baylor College of Medicine in Houston, and colleagues concluded.&lt;/p&gt;
&lt;p&gt;Several studies have shown that adolescents and adults with a higher body mass index (BMI) have lower antibody titers after HBV vaccination. The observations have taken on new significance, given that an increasing number of vaccines target a population that has a rising BMI, the authors wrote.&lt;/p&gt;
&lt;p&gt;Researchers hypothesize that standard-length needles do not penetrate through the deltoid fat and into the muscle of obese adolescents and adults. Because of its less abundant blood supply, adipose tissue may delay antigen presentation to B and T cells responsible for immune response, the authors continued.&lt;/p&gt;
&lt;p&gt;To test the hypothesis, Middleman and colleagues conducted a randomized, clinical trial involving adolescents and adults ages 14 to 24 with no prior exposure to HBV vaccine. Eligibility criteria included weight &amp;gt;90 kg for female patients and &amp;gt;120 kg for male patients.&lt;/p&gt;
&lt;p&gt;Patients were randomized to receive the HBV vaccine series with a standard one-inch needle or a 1.5-inch needle. Patients younger than 19 received 0.5-mL injections, and older patients received 1.0-mL injections.&lt;/p&gt;
&lt;p&gt;Investigators used a standardized injection procedure: insertion of the needle at a 90&amp;#176; angle to the deltoid muscle, leaving 2 to 3 mm of needle visible between the skin and the hub.&lt;/p&gt;
&lt;p&gt;Patients received three doses of vaccine at baseline, one month, and four months. Blood samples were obtained at baseline and two months after the final injection.&lt;/p&gt;
&lt;p&gt;The two groups did not differ significantly with respect to median age (21), BMI (~40), deltoid skinfold (41 mm), triceps skinfold (~40 mm), days between vaccine doses one and three (~135), and days from third vaccine dose to titer assessment (65).&lt;/p&gt;
&lt;p&gt;At the end of the study, 24 patients had completed the immunization protocol, 10 in the one-inch group and 14 in the 1.5-inch group.&lt;/p&gt;
&lt;p&gt;Patients vaccinated with a one-inch needle had a median antibody titer of 189.8 mIU/mL compared with 345.4 mIU/mL for patients vaccinated with the 1.5-inch needle (&lt;em&gt;P&lt;/em&gt;=0.03).&lt;/p&gt;
&lt;p&gt;The between-group difference remained significant in analyses that excluded an outlier from the 1.5-inch group (&lt;em&gt;P&lt;/em&gt;=0.047) and that excluded the only two male patients in the study (&lt;em&gt;P&lt;/em&gt;=0.035).&lt;/p&gt;
&lt;p&gt;&quot;As we continue to experience high rates of obesity in the U.S. and throughout the world, additional evidence-based research on optimizing the effective delivery of immunizations to adolescents and young adults will be critical,&quot; the authors wrote.&lt;/p&gt;
&lt;p&gt;&quot;Following updated needle length recommendations will be a first step toward improving the health of our youth and young adults by preventing vaccine-preventable diseases.&quot;&lt;/p&gt;
&lt;div style=&quot;float:left;border-style:solid;border-width:1px;border-color:#8dabbc;font-family:arial;font-size:12px;background-color:#DBE9F2;padding:5px;&quot;&gt;&lt;p&gt;The study was supported by federal grants and awards. GlaxoSmithKline provided the vaccine.&lt;/p&gt;&lt;p&gt;The authors had no disclosures.&lt;/p&gt;&lt;/div&gt;&lt;div style=&quot;clear:both;&quot;&gt;&lt;/div&gt;
    </recommendedItem>
    <recommendedItem id="20100101_19_310"
                     title="Rotavirus Vaccine Effective in Third World Nations (CME/CE)"
                     score="0.002"
                     href="http://www.medpagetoday.com/Pediatrics/Vaccines/tb/18174?impressionId=1265798793483"
                     
      &lt;p&gt;Vaccination against rotavirus appears to be highly effective in reducing death and serious gastrointestinal disease among young children in developing countries, according to two&lt;strong&gt; &lt;/strong&gt;publications in the Jan. 28 &lt;em&gt;New England Journal of Medicine.&lt;/em&gt;&lt;/p&gt;
&lt;p&gt;In Malawi and South Africa, a vaccination program significantly reduced infantile gastroenteritis associated with the pathogen, researchers said.&lt;/p&gt;
&lt;p&gt;In a companion paper, investigators reported that a rotavirus vaccination program in Mexico appears to have been the cause of a marked reduction in deaths from diarrhea among young children.&lt;/p&gt;
&lt;p&gt;Taken together, the two studies suggest that physicians have &quot;another powerful weapon&quot; to help prevent death from diarrhea among young children, according to Mathuram Santosham, MD, of the Johns Hopkins Bloomberg School of Public Health, who was not involved in the research.&lt;/p&gt;
&lt;p&gt;&quot;It is time to act to combat the 1.8 million unnecessary deaths from diarrhea that continue to occur each year,&quot; Santosham wrote in an accompanying editorial.&lt;/p&gt;
&lt;p&gt;Two oral, live attenuated vaccines against rotavirus have been shown to prevent the associated gastroenteritis  --  GlaxoSmithKline&apos;s Rotarix and Merck&apos;s RotaTeq, according to Nigel Cunliffe, MBChB, PhD, of the University of Liverpool in England, and colleagues.&lt;/p&gt;
&lt;p&gt;But trials of those drugs mainly occurred in more developed countries, the researchers noted, so the World Health Organization  --  fearing they might not work as well among the very poor  --  suggested additional trials in the Third World.&lt;/p&gt;
&lt;p&gt;To fill the knowledge gap, Cunliffe and colleagues conducted a randomized, placebo-controlled trial in Malawi and South Africa, enrolling 4,939 healthy infants.&lt;/p&gt;
&lt;p&gt;They were assigned to get either three doses of placebo (at six, 10, and 14 weeks of age), two doses of the Rotarix vaccine and one of placebo to maintain blinding, or three doses of the vaccine.&lt;/p&gt;
&lt;p&gt;The researchers found: &lt;ul&gt; &lt;li&gt;Severe gastroenteritis caused by rotavirus occurred in 4.9% of the placebo group and in 1.9% of the pooled vaccine group, yielding a vaccine efficacy of 61.2%, which was significant at &lt;em&gt;P&lt;/em&gt;&amp;lt;0.001. &lt;/li&gt; &lt;li&gt;Vaccine efficacy was lower in Malawi than in South Africa  --  49.4% versus 76.9%. But the vaccine prevented more cases of severe rotavirus gastroenteritis in Malawi  --  6.7 cases prevented per 100 infants vaccinated yearly versus 4.2.&lt;/li&gt; &lt;li&gt;Efficacy against all-cause severe gastroenteritis was 30.2%.&lt;/li&gt; &lt;li&gt;At least one serious adverse event was reported in 9.7% of the vaccinated infants and 11.5% of the placebo group, but only three were judged to be related to the vaccine.&lt;/li&gt; &lt;li&gt;There was a single case of intussusception -- a 6-month-old child in the three-dose vaccine group, who recovered after bowel resection.&lt;/li&gt; &lt;/ul&gt;&lt;/p&gt;
&lt;p&gt;The findings have led WHO to recommend that rotavirus vaccination be included in all national immunization programs, Cunliffe and colleagues noted.&lt;/p&gt;
&lt;p&gt;Mexico phased in rotavirus vaccination over slightly more than a year, from February 2006 through May 2007, according to Manish Patel, MD, of the CDC, and colleagues.&lt;/p&gt;
&lt;p&gt;To estimate the effect of the program, Patel and colleagues compared annual deaths from diarrhea before and after the immunization program began.&lt;/p&gt;
&lt;p&gt;Over the four years before the program started, the median annual number of diarrhea-related deaths among children younger than five was 1,793, the researchers found, for a mortality rate of 18.1 deaths per 100,000.&lt;/p&gt;
&lt;p&gt;In 2008, by contrast, there were 1,118 deaths, a reduction of 765, which yielded a mortality rate of 11.8 per 100,000 children, they reported in the journal.&lt;/p&gt;
&lt;p&gt;The rate reduction of 35% was significant at &lt;em&gt;P&lt;/em&gt;&amp;lt;0.001, Patel and colleagues said.&lt;/p&gt;
&lt;p&gt;The findings come with some caveats, the researchers said. Among them: &lt;ul&gt; &lt;li&gt;It was not possible to pin down the reduction in deaths attributable to vaccination because precise vaccine coverage information is lacking. &lt;/li&gt; &lt;li&gt;Other changes, such as hygiene improvements, might also have affected the trend.&lt;/li&gt; &lt;li&gt;Because of difficulty obtaining fecal specimens, it wasn&apos;t possible to study trends in rotavirus deaths specifically.&lt;/li&gt; &lt;/ul&gt;&lt;/p&gt;
&lt;p&gt;While the studies suggests that rotavirus vaccination would prevent much disease and many deaths, there are obstacles to introducing the vaccine to poorer countries, Santosham noted in the editorial.&lt;/p&gt;
&lt;p&gt;A key obstacle, he said, is that the vaccine requires more refrigeration  --  so-called &quot;cold-chain&quot; storage  --  than typical childhood vaccines.&lt;/p&gt;
&lt;p&gt;Also problematic, he said, is the current recommendation that the vaccines be given early in life to avoid age-dependent occurrence of intussusception, which led to an earlier vaccine being taken off the market.&lt;/p&gt;
&lt;p&gt;In many of the poorest countries, on-time vaccination is rare, which may impede the use of a rotavirus vaccine unless the time window for administration can be opened wider, he said.&lt;/p&gt;
&lt;div style=&quot;float:left;border-style:solid;border-width:1px;border-color:#8dabbc;font-family:arial;font-size:12px;background-color:#DBE9F2;padding:5px;&quot;&gt;&lt;p&gt;The African study was supported by GlaxoSmithKline and the PATH Rotavirus Vaccine Program, a collaboration with the World Health Organization and the CDC with support from the Global Alliance for Vaccines and Immunization (GAVI). Cunliffe reported financial links with Sanofi Pasteur and GlaxoSmithKline.&lt;/p&gt;&lt;p&gt;For the Mexican study, the researchers did not report any external support or any conflicts.&lt;/p&gt;&lt;p&gt;Santosham reported financial links with GlaxoSmithKline and Merck, both of which make rotavirus vaccines.&lt;/p&gt;&lt;/div&gt;&lt;div style=&quot;clear:both;&quot;&gt;&lt;/div&gt;
    </recommendedItem>
    <recommendedItem id="20100101_19_277"
                     title="Liver Cell Culture System Might Test New HCV Drugs (CME/CE)"
                     score="0.002"
                     href="http://www.medpagetoday.com/InfectiousDisease/Hepatitis/tb/18133?impressionId=1265798793483"
                     
      &lt;p&gt;Researchers say they can now grow liver cells that maintain their functions long enough to test potential treatments for hepatitis C.&lt;/p&gt;
&lt;p&gt;The method uses so-called &quot;micropatterned co-cultures&quot; of primary human hepatocytes and supportive stroma, according to Sangeeta N. Bhatia, MD, PhD, of MIT, and colleagues.&lt;/p&gt;
&lt;p&gt;The co-cultures were able to support the entire life cycle of hepatitis C, including infection and replication, Bhatia and colleagues reported online in the &lt;em&gt;Proceedings of the National Academy of Sciences&lt;/em&gt;.&lt;/p&gt;
&lt;p&gt;Coupled with reporter systems, the co-cultures have &quot;potential as a high-throughput platform for simultaneous assessment of in vitro efficacy and toxicity&quot; of antiviral drugs, the researchers said.&lt;/p&gt;
&lt;p&gt;The lack of such a system has been a roadblock to testing potential treatments for the virus, which affects 130 million people around the world, the researchers noted in the journal.&lt;/p&gt;
&lt;p&gt;Recently, they added, researchers have been able to propagate the virus in human hepatoma cells, but those cells, among other issues, proliferate abnormally and have disturbed gene expression.&lt;/p&gt;
&lt;p&gt;To overcome those obstacles, the researchers turned to primary hepatocytes, which would make a better test system, except that they are notoriously hard to maintain in culture.&lt;/p&gt;
&lt;p&gt;To form the co-cultures, Bhatia and colleagues seeded multi-well plates with human hepatocytes, followed several hours later by murine fibroblasts.&lt;/p&gt;
&lt;p&gt;&quot;If you just put cells on a surface in an unorganized way, they lose their function very quickly,&quot; Bhatia said in a statement. &quot;If you specify which cells sit next to each other, you can extend the lifetime of the cells and help them maintain their function.&quot;&lt;/p&gt;
&lt;p&gt;In a series of experiments, Bhatia and colleagues found:&lt;ul&gt; &lt;li&gt;Pseudoparticles bearing the hepatitis C glycoproteins E1 and E2 were able to infect between 1% and 3% of the hepatocytes, but did not infect the fibroblasts.&lt;/li&gt; &lt;li&gt;A hepatitis C virus modified to express a fluorescent protein persistently replicated over a two-week period.&lt;/li&gt; &lt;li&gt;Infectious virus was found in the co-culture supernatant from four through 12 days after initial infection.&lt;/li&gt; &lt;/ul&gt;&lt;/p&gt;
&lt;p&gt;The researchers also tested some possible therapeutics, including antibodies against viral entry factors and viral protease inhibitors, and were able to show effects on replication of hepatitis C.&lt;/p&gt;
&lt;p&gt;They were also able to test two or more drugs simultaneously to show the feasibility of combination drug studies using the system.&lt;/p&gt;
&lt;p&gt;Although the system is &quot;an important step forward,&quot; Bhatia and colleagues said, the co-cultures have some limitations, including the relatively inefficient uptake of virus.&lt;/p&gt;
&lt;p&gt;But they concluded that the co-cultures have the potential to be a &quot;highly valuable system for studies of (hepatitis C) biology.&quot;&lt;/p&gt;
&lt;div style=&quot;float:left;border-style:solid;border-width:1px;border-color:#8dabbc;font-family:arial;font-size:12px;background-color:#DBE9F2;padding:5px;&quot;&gt;&lt;p&gt;This study had support from the Greenberg Medical Research Institute, the Ellison Medical Foundation, the Starr Foundation, the Ronald A. Shellow Memorial Fund, the Richard Salomon Family Foundation, and the NIH. The researchers said they had no conflicts.&lt;/p&gt;&lt;/div&gt;&lt;div style=&quot;clear:both;&quot;&gt;&lt;/div&gt;
    </recommendedItem>
    <recommendedItem id="20100101_19_217"
                     title="Herpes Therapy Doesn&apos;t Bar HIV Transmission (CME/CE)"
                     score="-0.005"
                     href="http://www.medpagetoday.com/HIVAIDS/HIVAIDS/tb/18071?impressionId=1265798793483"
                     
      &lt;p&gt;Treating herpes has no effect on the transmission of HIV among discordant couples, researchers said.&lt;/p&gt;
&lt;p&gt;The lack of efficacy was found in a large, randomized clinical trial despite significant reductions in HIV viral load among those treated for herpes simplex-2 (HSV-2), according to Connie Celum, MD, of the University of Washington, and colleagues.&lt;/p&gt;
&lt;p&gt;Researchers will have to look for new ways to prevent transmission among discordant couples (in which one partner has HIV and the other does not), Celum and colleagues concluded online in the&lt;em&gt; New England Journal of Medicine.&lt;/em&gt;&lt;/p&gt;
&lt;p&gt;The study comes after earlier trials also showed that treating HSV-2 with the antiviral acyclovir (Zovirax) did not lower the risk of getting HIV. (See &lt;a href=&quot;http://www.medpagetoday.com/HIVAIDS/HIVAIDS/9884&quot; mce_href=&quot;http://www.medpagetoday.com/HIVAIDS/HIVAIDS/9884&quot; target=&quot;_blank&quot;&gt;Herpes Treatment No Help in Preventing HIV&lt;/a&gt;)&lt;/p&gt;
&lt;p&gt;The trials  --  and the current study  --  had their origins in epidemiological and laboratory observations that having an HSV-2 infection increased the risk of contracting HIV.&lt;/p&gt;
&lt;p&gt;Researchers reasoned that a converse effect might also be true  --  treating HSV-2 in HIV-negative people might reduce their risk of infection.&lt;/p&gt;
&lt;p&gt;The reasoning was bolstered by clinical trials showing that treating HSV-2 in HIV-positive people lowered their viral load.&lt;/p&gt;
&lt;p&gt;In the current study, that effect also occurred. HIV-positive volunteers treated with acyclovir saw, on average, a reduction in plasma concentration of HIV by 0.25 log&lt;sub&gt;10&lt;/sub&gt; copies per milliliter compared with members of the placebo group. The difference was significant at &lt;em&gt;P&lt;/em&gt;&amp;lt;0.001.&lt;/p&gt;
&lt;p&gt;But transmission among the couples was not affected, implying that a greater reduction in viral load is needed, the researchers said.&lt;/p&gt;
&lt;p&gt;The study, randomized and placebo-controlled, included 3,408 couples in Africa in which only one of the partners had HIV (but was not taking antiretroviral therapy) and also had an HSV-2 infection.&lt;/p&gt;
&lt;p&gt;The outcome was first reported at the Cape Town meeting of the International AIDS Society last year (See &lt;a href=&quot;http://www.medpagetoday.com/MeetingCoverage/IAS/15242&quot; mce_href=&quot;http://www.medpagetoday.com/MeetingCoverage/IAS/15242&quot; target=&quot;_blank&quot;&gt;IAS: Acyclovir Flops in Preventing HIV Transmission&lt;/a&gt;)&lt;/p&gt;
&lt;p&gt;The primary outcome was transmission between partners, verified by genetic sequencing of the virus.&lt;/p&gt;
&lt;p&gt;Transmission between partners was verified in 84 of the 132 recorded cases of transmission, the researchers said, and they were evenly divided  --  41 among those getting the drug and 43 in the placebo group.&lt;/p&gt;
&lt;p&gt;On the other hand, the use of the drug reduced the occurrence of herpes lesions by 73%, which was significant at &lt;em&gt;P&lt;/em&gt;&amp;lt;0.001.&lt;/p&gt;
&lt;p&gt;The reduction of herpes lesions suggests that the drug was being used, the researchers said, and therefore that the lack of efficacy against HIV was not a result of nonadherence to acyclovir.&lt;/p&gt;
&lt;p&gt;Overall, the rate of HIV transmission in the study was 2.7 cases per 100 person-years, markedly lower than earlier observations. The researchers attributed that to such interventions as monthly counseling on risk reduction and free condoms.&lt;/p&gt;
&lt;div style=&quot;float:left;border-style:solid;border-width:1px;border-color:#8dabbc;font-family:arial;font-size:12px;background-color:#DBE9F2;padding:5px;&quot;&gt;&lt;p&gt;The study had support from the Bill and Melinda Gates Foundation, as well as the University of Washington, the National Institute of Allergy and Infectious Diseases, Gen-Probe, and the National Institute of Mental Health.&lt;/p&gt;&lt;p&gt;Celum reported financial links with GlaxoSmithKline and several other authors reported links with various pharamceutical companies.&lt;/p&gt;&lt;/div&gt;&lt;div style=&quot;clear:both;&quot;&gt;&lt;/div&gt;
    </recommendedItem>
    <recommendedItem id="20090101_1_601"
                     title="Immunization Advisers Recommend Hepatitis A Vaccine For Kids"
                     score="-0.005"
                     href="