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Cergole-Novella MC, Matsuda EM, de Souza MB, Colpas DR, Carmo AMDS, Daros VDSMG, Campos IB. Recurrent community-acquired pneumococcal meningitis in adults with and without identified predisposing factors. Braz J Microbiol 2024; 55:1339-1348. [PMID: 38438832 PMCID: PMC11153432 DOI: 10.1007/s42770-024-01292-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Accepted: 02/20/2024] [Indexed: 03/06/2024] Open
Abstract
Bacterial meningitis is still a significant public health concern, with high morbidity and mortality rates. Despite this, it is still a rare event that requires the bacterial invasion of the meninges. However, some predisposing factors can trigger recurrent episodes of meningitis. This study is aimed at determining the clinical characteristics and the molecular epidemiology of episodes of recurrent community-acquired meningitis with and without predisposing factors. For this purpose, we performed a retrospective study of our laboratory database during the period of 2010 to 2020. Additionally, using molecular tools developed in our previous works, the epidemiology of the pathogens causing these episodes was analyzed using cerebrospinal fluid samples, especially in the absence of isolated strains. We observed a total of 1,779 meningitis cases and 230 were caused by Streptococcus pneumoniae. Of those, 16 were recurrent meningitis episodes (16/1,779; 0.9%) from seven patients. Pneumococcus was the main agent responsible in these recurrent episodes and only two episodes were caused by Haemophilus influenzae. The mean age of these patients was 20 years old and three had predisposing factors which could have led to contracting meningitis. The samples presented different pneumococcal serotypes. Most of them were non-vaccine-covered serotypes and antibiotic susceptible strains. Therefore, it was demonstrated how the practical employment of molecular tools, developed for research, when applied in the routine of diagnosis, can provide important information for epidemiological surveillance. Furthermore, it was shown how pneumococcus was the leading cause of recurrent community-acquired meningitis without predisposing factors, suggesting that pneumococcal vaccination may be necessary, even in those groups of individuals considered to be less susceptible.
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Affiliation(s)
- Maria Cecilia Cergole-Novella
- Adolfo Lutz Institute, Santo André Regional Center, Avenida Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, 09040-160, Brazil
| | - Elaine Monteiro Matsuda
- City Hall of Santo André, Santo André Health Secretary, Rua Primeiro de Maio, 133 - Centro, Santo André, SP, 09015-030, Brazil
| | - Mariana Brena de Souza
- Adolfo Lutz Institute, Santo André Regional Center, Avenida Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, 09040-160, Brazil
| | - Daniela Rodrigues Colpas
- Adolfo Lutz Institute, Santo André Regional Center, Avenida Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, 09040-160, Brazil
| | - Andréia Moreira Dos Santos Carmo
- Adolfo Lutz Institute, Santo André Regional Center, Avenida Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, 09040-160, Brazil
| | | | - Ivana Barros Campos
- Adolfo Lutz Institute, Santo André Regional Center, Avenida Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, 09040-160, Brazil.
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Mengstie GY, Awlachew ZT, Degefa AM. Screening of rhizobacteria for multi-trait plant growth-promoting ability and antagonism against B. fabae, the causative agent of chocolate spot disease of faba bean. Heliyon 2024; 10:e25334. [PMID: 38318010 PMCID: PMC10839597 DOI: 10.1016/j.heliyon.2024.e25334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 01/13/2024] [Accepted: 01/24/2024] [Indexed: 02/07/2024] Open
Abstract
This study aimed to isolate and characterize plant growth-promoting rhizobacteria from the faba bean rhizosphere for future inoculum production. For this purpose,127 dissimilar rhizobacterial colonies were isolated. All isolated colonies were tested for plant growth-promoting traits. Based on their multiple plant growth-promoting traits, eight potential isolates were selected and identified GY01, GY03, and GY08 are affiliated with Acinetobacter sp. GY04 and GY05 are affiliated with Chryseobacterium sp. GY06 and GY07 are affiliated with Pseudomonas costantinii and Pseudomonas chlororaphis, respectively; and GY02 is affiliated with the Bacterium strain. All eight isolates were evaluated for their effects on seed germination and vigor index and potential antagonism against Botrytis fabae. Selected isolates showed positive effects on seed germination and vigor index with different potentials. Isolate GY04 resulted in the highest vigor index (501), while isolate GY08 achieved the lowest (218). B. fabae radial growth inhibition was found in all eight isolates. The isolates inhibited the radial growth of the test pathogen with an inhibition efficacy of 72.38 % in GY04 to 25.57 % in GY-03. Generally, the results of this study indicated the potential of these isolates as a microbial inoculant with multiple functions for faba beans.
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Affiliation(s)
- Gebeyehu Yibeltie Mengstie
- Department of Biology, College of Natural and Computational Sciences, P.O. Box 90, Debark University, Debark, Ethiopia
- Department of Biology, College of Natural and Computational Sciences, P.O. Box 196, University of Gondar, Gondar, Ethiopia
| | - Zewdu Teshome Awlachew
- Department of Biology, College of Natural and Computational Sciences, P.O. Box 196, University of Gondar, Gondar, Ethiopia
| | - Atsede Muleta Degefa
- Department of Biology, College of Natural and Computational Sciences, P.O. Box 196, University of Gondar, Gondar, Ethiopia
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de Souza MB, de Carvalho E, Cergole-Novella MC, Molinari DA, Colpas DR, Dos Santos Carmo AM, Dos Santos Menezes Gaiotto Daros V, de Campos IB. Multiplex PCR to Streptococcus pneumoniae serotype identification directly in cerebrospinal fluid samples. Eur J Clin Microbiol Infect Dis 2023; 42:255-266. [PMID: 36662376 PMCID: PMC9854411 DOI: 10.1007/s10096-023-04547-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 01/11/2023] [Indexed: 01/21/2023]
Abstract
Streptococcus pneumoniae causes invasive diseases of significant public health concern, such as meningitis. The culture of cerebrospinal fluid (CSF) samples, the standard technique for meningitis diagnoses, is not always positive. Consequently, meaningful information about the etiological agent is lost, which can compromise effective epidemiological surveillance and the improvement of immunization policies. This study aims to standardize a method to genotype pneumococcus in the CSF samples which could mitigate the absence of isolated strains, and also evaluate the prediction of this assay. We applied eight multiplex PCR (mPCR) assays to CSF samples paired with the Quellung reaction applied to the isolated strains. We also compared different master mix kits in the mPCR. Moreover, a retrospective study was conducted with CSF samples considered pneumococcus positive due to the presence of the lytA gene. Results showed that genotyping by the mPCR correlated 100% with the Quellung reaction, and genotyping was dependent on the master mix applied. In the retrospective study (2014-2020), 73.4% were successfully genotyped. The analyses of the receiver operating characteristic curve showed that the cycle threshold (Ct value) around 30 for the lytA gene had a 75% positive chance of successful genotyping, whereas with a Ct value > 35, the chance was 12.5%. Finally, we observed that genotype 19A was prevalent in the period (12%), information unknown until now due to the lack of isolated strains. Therefore, the mPCR of CSF samples can efficiently predict S. pneumoniae serotypes, especially in the absence of isolated strains, which can be a great tool for pneumococcal serotype surveillance.
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Affiliation(s)
- Mariana Brena de Souza
- Adolfo Lutz Institute, Santo André Regional Center, Av. Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, Zip Code: 09040-160, Brazil
| | - Eneas de Carvalho
- Butantan Institute, Bacteriology Laboratory, Av. Vital Brasil, 1500 - Butantã, São Paulo, SP, Zip Code: 05503-900, Brazil
| | - Maria Cecília Cergole-Novella
- Adolfo Lutz Institute, Santo André Regional Center, Av. Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, Zip Code: 09040-160, Brazil
| | - Delma Aparecida Molinari
- Adolfo Lutz Institute, Santo André Regional Center, Av. Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, Zip Code: 09040-160, Brazil
| | - Daniela Rodrigues Colpas
- Adolfo Lutz Institute, Santo André Regional Center, Av. Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, Zip Code: 09040-160, Brazil
| | - Andréia Moreira Dos Santos Carmo
- Adolfo Lutz Institute, Santo André Regional Center, Av. Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, Zip Code: 09040-160, Brazil
| | | | - Ivana Barros de Campos
- Adolfo Lutz Institute, Santo André Regional Center, Av. Ramiro Colleoni, 240 - Vila Dora, Santo André, SP, Zip Code: 09040-160, Brazil.
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