{"id":358,"date":"2022-07-24T23:34:40","date_gmt":"2022-07-24T23:34:40","guid":{"rendered":"http:\/\/wmtc2006.com\/?p=358"},"modified":"2022-07-24T23:34:40","modified_gmt":"2022-07-24T23:34:40","slug":"although-neither-sex-nor-age-were-significantly-associated-with-disease-outcome-in-any-model-for-denv-3-we-ran-a-paired-case-control-analysis-matching-on-these-variables","status":"publish","type":"post","link":"https:\/\/wmtc2006.com\/?p=358","title":{"rendered":"\ufeffAlthough neither sex nor age were significantly associated with disease outcome in any model for DENV-3, we ran a paired case-control analysis, matching on these variables"},"content":{"rendered":"

\ufeffAlthough neither sex nor age were significantly associated with disease outcome in any model for DENV-3, we ran a paired case-control analysis, matching on these variables. a 4-fold rise in IgM titer between acute and convalescent samples (18%). Although symptomatic illness was more common with naive or monotypic serostatus than with multitypic serostatus (Table ?(Table2),2), the latter accounted for 45% of all detected cases of disease due to DENV-4. Overall, the ratio of apparent to inapparent DENV-4 infections was 1:9. Estimates of Disease Risk In a multivariable model, contamination history and Lck Inhibitor participant age were significantly associated with risk of disease due to DENV-4 contamination (Table ?(Table33 and Supplementary Tables 1 and 2). Monotypic DENV-1 antibodies were associated with reduced odds of disease, whereas monotypic DENV-2 or DENV-3 antibodies were not (Table ?(Table3).3). Disease risk was significantly reduced for individuals with multitypic serostatus (OR, 0.22; 95% CI, .13C.38), with additional protective effects beyond that of DENV-1 antibodies alone (= .0069 by the Lck Inhibitor<\/a> Wald test). Disease risk appeared to vary nonlinearly with age (Physique ?(Figure2),2), with the highest risk between 25 and 30 years of age. As with DENV-3, when city block was included as a random effect, no impact on the relationship between age, serostatus, and disease was observed. Matched-pairs case-control analysis also showed that the presence of antibodies to 2 DENV serotypes was associated with reduced disease, independent of age and sex (OR, 0.2; 95% CI, .086C.41). Open in a separate window Physique 2. Predicted risk of disease due to contamination with dengue computer virus serotype 4 (DENV-4), as a function of age and serostatus. Naive and monotypic exposures were combined because they were statistically indistinguishable ( .05). Curves were estimated from the best fit model (Table 3) and plotted with standard error of the mean. DISCUSSION Disease in Iquitos was significantly reduced among individuals with postsecondary DENV-3 and DENV-4 infections. Relative to average disease rates during primary and secondary infections, the incidence among postsecondary infections was reduced by 93% for DENV-3 Lck Inhibitor and 64% for DENV-4, even though contamination rates were not reduced among people with prior exposures to DENV. To our knowledge, this is the first population-based evidence quantifying a cumulative protective effect of heterologous DENV neutralizing antibodies against disease, which has been hypothesized for 40 years [36]. Previous studies investigating cross-protection in sequential infections have provided evidence for a short period of protection against classic dengue fever [37] and long-term protection against severe disease in third and fourth infections [10]. Although we did not attempt to estimate a short-term effect and we did not observe any cases of severe dengue, we were able to show that the effect of heterologous antibody was cumulative, resulting in a reduced incidence of disease during postsecondary contamination with DENV-3 or DENV-4. Cross-protection was not uniform across serotypes. People with DENV-1 neutralizing antibodies were less likely to develop disease, pointing to an epidemiologically important role of the sequence of infecting serotypes in determining clinical outcome [9, 29, 38C40]. This obtaining, however, is usually discordant Rabbit Polyclonal to SLC6A15<\/a> with the observation made in Cuba that infections with DENV-3 were more pathogenic in the presence of preexisting DENV-1 antibody than with DENV-2 antibody [41], which underscores the need to exercise caution in generalizing epidemiological observations between different populations. Previously, cross-reactive DENV-1 antibodies were hypothesized to protect against severe disease during secondary contamination with American genotype DENV-2 [29]. Together, these data indicate that, in the context of the study populace in Iquitos, DENV-1 antibodies may be broadly cross-protective but that antibodies to American DENV-2 and genotype III of DENV-3 are not, although they do contribute to a cumulative effect of reduced disease. In contrast to reduced rates of Lck Inhibitor disease, contamination rates were higher among people with neutralizing antibody to 2 DENV serotypes. Studies in Cuba of 1981 and 1997 dengue epidemics also found higher contamination rates in individuals with prior DENV exposure [42, 43], which the authors hypothesized was due to household-level heterogeneities in mosquito populations. In Iquitos, we have observed consistent spatial variation in populace densities [44] that correlates well with patterns of seroprevalence on broad spatial scales [19, 30] and supports the premise that seroconversion rates are attributable at least in part to variation in individual exposure to mosquito bites..<\/p>\n","protected":false},"excerpt":{"rendered":"

\ufeffAlthough neither sex nor age were significantly associated with disease outcome in any model for DENV-3, we ran a paired case-control analysis, matching on these […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45],"tags":[],"class_list":["post-358","post","type-post","status-publish","format-standard","hentry","category-hydroxytryptamine-5-transporters"],"yoast_head":"\n\ufeffAlthough neither sex nor age were significantly associated with disease outcome in any model for DENV-3, we ran a paired case-control analysis, matching on these variables - Discovery and characterization of Histamine-2 Receptor Antagonists<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/wmtc2006.com\/?p=358\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\ufeffAlthough neither sex nor age were significantly associated with disease outcome in any model for DENV-3, we ran a paired case-control analysis, matching on these variables - 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