11 research outputs found
Median density in log<sub>10</sub> genome equivalents/ml of pneumococcus (SP), <i>H</i>. <i>influenzae</i> (HI), and <i>M</i>. <i>catarrhalis</i> (MC) when found with (+) or without (-) another species.
<p>Median density in log<sub>10</sub> genome equivalents/ml of pneumococcus (SP), <i>H</i>. <i>influenzae</i> (HI), and <i>M</i>. <i>catarrhalis</i> (MC) when found with (+) or without (-) another species.</p
Dengue and Other Common Causes of Acute Febrile Illness in Asia: An Active Surveillance Study in Children
<div><p>Background</p><p>Common causes of acute febrile illness in tropical countries have similar symptoms, which often mimic those of dengue. Accurate clinical diagnosis can be difficult without laboratory confirmation and disease burden is generally under-reported. Accurate, population-based, laboratory-confirmed incidence data on dengue and other causes of acute fever in dengue-endemic Asian countries are needed.</p><p>Methods and principal findings</p><p>This prospective, multicenter, active fever surveillance, cohort study was conducted in selected centers in Indonesia, Malaysia, Philippines, Thailand and Vietnam to determine the incidence density of acute febrile episodes (≥38°C for ≥2 days) in 1,500 healthy children aged 2–14 years, followed for a mean 237 days. Causes of fever were assessed by testing acute and convalescent sera from febrile participants for dengue, chikungunya, hepatitis A, influenza A, leptospirosis, rickettsia, and <i>Salmonella</i> Typhi. Overall, 289 participants had acute fever, an incidence density of 33.6 per 100 person-years (95% CI: 30.0; 37.8); 57% were IgM-positive for at least one of these diseases. The most common causes of fever by IgM ELISA were chikungunya (in 35.0% of in febrile participants) and <i>S.</i> Typhi (in 29.4%). The overall incidence density of dengue per 100 person-years was 3.4 by nonstructural protein 1 (NS1) antigen positivity (95% CI: 2.4; 4.8) and 7.3 (95% CI: 5.7; 9.2) by serology. Dengue was diagnosed in 11.4% (95% CI: 8.0; 15.7) and 23.9% (95% CI: 19.1; 29.2) of febrile participants by NS1 positivity and serology, respectively. Of the febrile episodes not clinically diagnosed as dengue, 5.3% were dengue-positive by NS1 antigen testing and 16.0% were dengue-positive by serology.</p><p>Conclusions</p><p>During the study period, the most common identified causes of pediatric acute febrile illness among the seven tested for were chikungunya, <i>S.</i> Typhi and dengue. Not all dengue cases were clinically diagnosed; laboratory confirmation is essential to refine disease burden estimates.</p></div
Nasopharyngeal carriage prevalence (%) of <i>S</i>. <i>pneumoniae</i>, <i>H</i>. <i>influenzae</i>, <i>M</i>. <i>catarrhalis</i>, and <i>S</i>. <i>aureus</i> in Indonesian children aged 12–24 months.
<p>Results are shown by region (Bandung, Padang, and Lombok). Error bars represent 95%CI.</p
Incidence density of dengue in febrile participants.
†<p>For each participant, only the first occurrence of a dengue-positive acute febrile episode was used to calculate incidence density.</p>‡<p>Incidence density per 100 person-years of study follow-up. Laboratory-confirmed dengue: NS1 positive; Probable dengue: IgM positive and/or fourfold rise in IgG.</p
The twenty most common pneumococcal serotypes identified in nasopharyngeal swabs collected from Indonesian children aged 12–24 months, shown by region (Bandung, Padang, and Lombok).
<p>* indicates serotypes included in PCV10 and <sup>+</sup> indicates the additional three serotypes included in PCV13.</p
Baseline demographic characteristics of the study cohort.
†<p>Where a participant was enrolled the day before his/her birthday, the age was rounded to 15.0 years. N is the number of participants present at Visit 1.</p
Frequency of most commonly detected non-dengue infections in febrile participants.
<p>Data are the percentage of participants who had at least one acute febrile episode during the study, for whom IgM antibodies to these pre-specified infections were detected in acute or convalescent sera.</p
Incidence density of non-dengue infections in febrile participants.
<p>Acute infections were determined by IgM positivity.</p>†<p>For each participant, only the first occurrence of an infection was used to calculate incidence density.</p>‡<p>Incidence density per 100 person-years of follow-up. NC: not calculated.</p
Percentage of virologically and serologically diagnosed dengue cases amongst participants who had at least one acute febrile episode during the study.
<p>Laboratory-confirmed dengue: NS1 antigen positive; Probable dengue: IgM positive and/or fourfold rise in IgG.</p