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1.
Clin Infect Dis ; 73(3): e745-e753, 2021 08 02.
Artigo em Inglês | MEDLINE | ID: mdl-33530100

RESUMO

BACKGROUND: Policy recommendations on pertussis vaccination need to be guided by data, which are limited from low- and middle-income countries. We aimed to describe the epidemiology of pertussis in South Africa, a country with high human immunodeficiency virus (HIV) prevalence and routine pertussis vaccination for 6 decades including the acellular vaccine since 2009. METHODS: Hospitalized patients of all ages were enrolled at 5 sentinel sites as part of a pneumonia surveillance program from January 2013 through December 2018. Nasopharyngeal specimens and induced sputum were tested by polymerase chain reaction (PCR) for Bordetella pertussis. In addition, demographic and clinical information were collected. Incidence rates were calculated for 2013-2016, and multivariable logistic regression performed to identify factors associated with pertussis. RESULTS: Over the 6-year period 19 429 individuals were enrolled, of which 239 (1.2%) tested positive for B. pertussis. Detection rate was highest in infants aged <6 months (2.8%, 155/5524). Mean annual incidence was 17 cases per 100 000 population, with the highest incidence in children <1 year of age (228 per 100 000). Age-adjusted incidence was 65.9 per 100 000 in HIV-infected individuals compared to 8.5 per 100 000 in HIV-uninfected individuals (risk ratio 30.4, 95% confidence interval: 23.0-40.2). Ten individuals (4.2%) with pertussis died; of which 7 were infants aged <6 months and 3 were immunocompromised adults. CONCLUSIONS: Pertussis continues to be a significant cause of illness and hospitalization in South Africa, despite routine vaccination. The highest burden of disease and death occurred in infants; however, HIV-infected adults were also identified as an important group at risk of B. pertussis infection.


Assuntos
Coqueluche , Adulto , Bordetella pertussis , Criança , Humanos , Incidência , Lactente , Vacina contra Coqueluche , África do Sul/epidemiologia , Coqueluche/epidemiologia
2.
BMC Infect Dis ; 19(1): 276, 2019 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-30898099

RESUMO

BACKGROUND: We assessed the utility of a multi-target, real-time PCR assay for Bordetella pertussis detection and diagnosis in patients with severe respiratory illness (SRI), influenza-like illness (ILI), and asymptomatic controls. METHODS: Real-time PCR detection of IS481, pIS1001, hIS1001 and ptxS1 was performed on nasopharyngeal specimens (SRI, ILI and controls) and induced sputum (SRI) collected from June 2012 to May 2016 through respiratory illness surveillance. Using PCR cycle threshold (Ct) value cut-offs, IS481 positive cases were classified as confirmed (Ct < 35) or possible (Ct 35-39) pertussis disease. RESULTS: Among 12,922 samples, 146 (1.1%) were IS481 positive of which 62% (90/146) were classified as confirmed. The attributable fraction (AF) was 92.2% (95% CI, 65.6 to 98.2%) and 90.5% (95% CI, 57.5 to 97.9%) amongst SRI and ILI PCR-confirmed pertussis cases, respectively. Amongst possible pertussis cases, AF was 36.9% (95% CI, - 142.3 to 83.6%) and 67.5% (95% CI, - 30.6 to 91.9%) in the SRI and ILI groups, respectively. CONCLUSION: All IS481 positive specimens could be considered as B. pertussis infection, and potentially pertussis disease with supportive clinical information.


Assuntos
Bordetella pertussis/genética , Tipagem Molecular , Coqueluche/diagnóstico , Diagnóstico Diferencial , Humanos , Reação em Cadeia da Polimerase em Tempo Real , Infecções Respiratórias/diagnóstico , Infecções Respiratórias/epidemiologia , Infecções Respiratórias/microbiologia , África do Sul , Coqueluche/epidemiologia , Coqueluche/microbiologia
3.
Emerg Infect Dis ; 24(3): 506-513, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29460736

RESUMO

During 2012-2015, we tested respiratory specimens from patients with severe respiratory illness (SRI), patients with influenza-like illness (ILI), and controls in South Africa by real-time PCR for Mycoplasma pneumoniae, followed by culture and molecular characterization of positive samples. M. pneumoniae prevalence was 1.6% among SRI patients, 0.7% among ILI patients, and 0.2% among controls (p<0.001). Age <5 years (adjusted odd ratio 7.1; 95% CI 1.7-28.7) and HIV infection (adjusted odds ratio 23.8; 95% CI 4.1-138.2) among M. pneumonia-positive persons were associated with severe disease. The detection rate attributable to illness was 93.9% (95% CI 74.4%-98.5%) in SRI patients and 80.7% (95% CI 16.7%-95.6%) in ILI patients. The hospitalization rate was 28 cases/100,000 population. We observed the macrolide-susceptible M. pneumoniae genotype in all cases and found P1 types 1, 2, and a type 2 variant with multilocus variable number tandem repeat types 3/6/6/2, 3/5/6/2, and 4/5/7/2.


Assuntos
Mycoplasma pneumoniae , Pneumonia por Mycoplasma/epidemiologia , Pneumonia por Mycoplasma/microbiologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Criança , Pré-Escolar , Infecções Comunitárias Adquiridas/epidemiologia , Infecções Comunitárias Adquiridas/história , Infecções Comunitárias Adquiridas/microbiologia , Feminino , Genótipo , História do Século XXI , Hospitalização , Humanos , Lactente , Masculino , Pessoa de Meia-Idade , Mycoplasma pneumoniae/classificação , Mycoplasma pneumoniae/genética , Pneumonia por Mycoplasma/história , Vigilância da População , Prevalência , Fatores de Risco , África do Sul/epidemiologia , Adulto Jovem
4.
Emerg Infect Dis ; 23(8): 1308-1315, 2017 08.
Artigo em Inglês | MEDLINE | ID: mdl-28726616

RESUMO

In 2015, a cluster of respiratory diphtheria cases was reported from KwaZulu-Natal Province in South Africa. By using whole-genome analysis, we characterized 21 Corynebacterium diphtheriae isolates collected from 20 patients and contacts during the outbreak (1 patient was infected with 2 variants of C. diphtheriae). In addition, we included 1 cutaneous isolate, 2 endocarditis isolates, and 2 archived clinical isolates (ca. 1980) for comparison. Two novel lineages were identified, namely, toxigenic sequence type (ST) ST-378 (n = 17) and nontoxigenic ST-395 (n = 3). One archived isolate and the cutaneous isolate were ST-395, suggesting ongoing circulation of this lineage for >30 years. The absence of preexisting molecular sequence data limits drawing conclusions pertaining to the origin of these strains; however, these findings provide baseline genotypic data for future cases and outbreaks. Neither ST has been reported in any other country; this ST appears to be endemic only in South Africa.


Assuntos
Corynebacterium diphtheriae/classificação , Corynebacterium diphtheriae/genética , Difteria/epidemiologia , Difteria/microbiologia , Surtos de Doenças , Adolescente , Adulto , Sistemas CRISPR-Cas , Criança , Pré-Escolar , Corynebacterium diphtheriae/isolamento & purificação , Difteria/história , Feminino , Genoma Viral , História do Século XXI , Humanos , Lactente , Masculino , Tipagem de Sequências Multilocus , Filogenia , Sistema de Registros , África do Sul/epidemiologia , Sequenciamento Completo do Genoma , Adulto Jovem
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