Teses em Biologia de Agentes Infecciosos e Parasitários (Doutorado) - PPGBAIP/ICB

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/4698

O Doutorado em Biologia de Agentes Infecciosos e Parasitários teve início em 2005 e funciona no Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (PPGBAIP) do Instituto de Ciências Biológicas (ICB) da Universidade Federal do Pará (UFPA).

Navegar

Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Associação entre marcadores da resposta inflamatória e a imunopatogênese de agentes infecciosos de natureza viral (Vírus da dengue, HTLV-1 e HTLV-2) e bacteriana (Chlamydia trachomatis e Chlamydia pneumoniae)
(Universidade Federal do Pará, 2010-11-29) FEITOSA, Rosimar Neris Martins; ISHAK, Ricardo; http://lattes.cnpq.br/5621101706909450
The genetic basis of diseases is frequently studied aiming the polymorphisms of cytocine genes. The present study investigated markers of the inflammatory response associated to the course of infection and disease caused by viruses and bacteria. Serum levels (measured by an ELISA assay) and the polymorphisms (using PCR, RFLP and allele specific PCR) of TNF-α (-308), TNF-β (+252), IFN-γ (+874) and C reactive protein were measured among persons with febrile disease, infected by dengue virus (n=80), not infected by DV (100), a group of HTLV infected (30 symptomatic and 47 asymptomatic), a group with coronary disease (58 seroreactive to Chlamydia and 31 with negative serology) and a control group (99 persons with no reaction to DV, HTLV and Chlamydia). No group showed association with demographic informations. Dengue virus 3 (66.2%) and HTLV-1 (90% symptomatic and 76.6% asymptomatic persons) were the most frequent agents found among their groups. The majority of those with coronary disease (65.1%) presented antibodies to Chlamydia (39.6% to C. trachomatis and C. pneumoniae, 58.6% solely to C. trachomatis and 1.7% to C. pneumoniae). Statistically significant levels of differences were found among: (i) serum levels of TNF-β, IFN-γ and PrtCR of positive and negative dengue and control groups (p< 0,01); (ii) serum levels of TNF-α, TNF-β and IFN-γ of HTLV (including its types) and control groups; (iii) serum levels of TNF-α, TNF-β, IFN-γ and PrtCR among patients with coronary disease, serum reactive to Chlamydia, and the control group; (iv) the presence of antibodies to C. trachomatis and C. pneumoniae and the control group comparing TNF-β, IFN-γ and PrtCR. Genotypic frequency distributions were statistically significant for the polymorphisms: (i) of TNF-α (p=0,0494) and IFN-γ (p= 0,0008) genes among positive, negative and control dengue groups and to IFN-γ (p= 0,0007) among groups DEN 1, DEN 2, DEN 3 and controls; (ii) of IFN-γ gene (p= 0,0023) among the group of patients with coronary disease and sero reactivity to C. trachomatis e C. pneumoniae, as well as to the mono reactants in the comparison between the positivity to C. trachomatis and the control group.
Acesso aberto (Open Access)
Caracterização molecular de Klebsiella pneumoniae produtoras de ß-lactamases de espectro ampliado e Carbapenemase tipo KPC isoladas de pacientes hospitalizados em Belém, estado do Pará
(Universidade Federal do Pará, 2016-12-13) MARQUES, Patrícia Bentes; LOUREIRO, Edvaldo Carlos Brito; http://lattes.cnpq.br/2685418720563351
The antimicrobial resistance in Enterobacteriaceae is increasing worldwide. The K. pneumoniae constitute an important group of human patogen, causing of hospital and communitarian infections. In these bacteria, the production of extended spectrum beta-lactamases (ESBL) is one of the main mechanisms of resistance the antimicrobials, responsible for the imperfection of the therapy against infections for gram-negative bacilli. This work aimed to do the molecular characterization of the K. pneumoniae producing ESBL and KPC about antimicrobial resistence in pacients from Belém-PA. A total of 124 K. pneumoniae isolates were collected from public hospital from Belém-PA and susceptibility test was performed to detect its susceptibility patterns antibiotics. Phenotypic tests for extended-spectrum beta-lactamases (ESBLs) and carbapenemase-producing Klebsiella pneumoniae (KPC) producing strains were performed to detect the resistance phenotype of the isolates. Then PCR amplification and sequencing analysis were performed for the drug resistance determinants genes. The results showed that 83% strains harbored bla CTX-M gene, 85,5% carried bla SHV , 83% carried bla TEM and 5% carried bla KPC. The most frequent gene ESBL detected was bla CTX-M-71, which was observed in 60% of isolates. Other ESBL genes were bla SHV-38 (5% of isolates), bla SHV-100 (5% of isolates) and bla SHV-12 (3,5% of isolates). O gene bla KPC-2 was detected in 100% of isolates.These enterobacterias showed multidrug resistance phenotypes with high levels for quinolones and aminoglycosides. Associations between genotypes and antibiotic resistance were observed.The presence of multidrug resistant micro-organisms in hospitals, reinforces the need for measures for rapid containment of possibles infections caused by these pathogens.
Acesso aberto (Open Access)
Diversidade genética de isolados ambientais de Vibrio cholerae da Amazônia brasileira
(Universidade Federal do Pará, 2009-09-30) SÁ, Lena Líllian Canto de; VICENTE, Ana Carolina Paulo; http://lattes.cnpq.br/9393006603341915
Vibrio cholerae, the etiologic agent of cholera, is an autochtonus bacterium of aquatic environment in temperate and tropical regions of the world. Cholera is endemic and epidemic in many countries in Africa, Asia and Central and South America. In this study our goal was to detemine the genetic diversity of V.cholerae environmental isolates from aquatic ecosystems in the Amazon region of Brazil. A total of 148 environmental strains of V.cholerae non-O1 and non-O139 (NAG) and O1 serogroups, isolated from the Amazon region since 1977 to 2007, were characterized and compared with clinical strains of V.cholerae O1 from sixty and seventh cholera pandemic. PFGE (pulsed-field gel electrophoresis) was performed to determine the clonal relationships between V.cholerae non-O1, O1 environmental and clinical strains. The presence of virulence genes (hlyA/hem, hlyB, hlyC, rtxA, rtxC, tcp, ctx, zot, ace, stn/sto) and class 1, 2 and 3 integrons (intI 1, 2 e 3) was analyzed by polymerase chain reaction. Whole genome macrorestriction analysis revealed that the environmental V.cholerae NAGs were more diverse than the environmental O1 strains, both groups segregate in distinct clusters and most of environmental O1 strains show a clonal relationship with seventh cholera pandemic strains. The distribution of virulence genes in NAGs strains is largely different from that of O1 strains which, in general, were positive for all virulence genes analyzed excepting for stn/sto and class 1, 2 and 3 integrons. Some O1 environmental strains, belonging to the seventh pandemic lineage, went through an extensive gene loss. Distinct NAGs strains were stn/sto+ and intI 1+. Two alleles of aadA were found: aadA2 and aadA7. Interestingly, V.cholerae O1 environmental strains belonging to the pandemic lineage were only isolated during the period of cholera epidemic in the Amazon region of Brazil (1991-1996).
Acesso aberto (Open Access)
Epidemiologia descritiva de Salmonella em ecossistemas aquáticos de diferentes áreas do Estado do Pará
(Universidade Federal do Pará, 2007-09-20) LOUREIRO, Edvaldo Carlos Brito; ISHAK, Ricardo; http://lattes.cnpq.br/5621101706909450
Surveillance of Salmonella serotypes in aquatic environments is an important procedure for the monitoring of human and animal infections. The analysis of 694 samples of water collected from river, creek, bay, beaches, lake, well, nascent, provisioning water, stream, drainage and sewage distributed along 11 districts in the State of Pará, Brazil, yielded 212 (30,5%) contaminated samples with 91 serotypes and 2,115 strains of Salmonella. In Belém, 77 sorotypes were identified out of 1,300 isolates from freshwater and sewage; S. Saintpaul, S. Panama, S. Muenster, S. Hadar and S. Agona were the most frequent serotypes. In the National Forest of Caxiuanã, 69,4% of water samples were positive for Salmonella and 17 serotypes were identified, being S. Panama, S. Miami and S. Gaminara the most frequent ones. Antibiotic resistance was described in 64.8% of the Salmonella isolates from aquatic environments, with a special importance to streptomycin (97,1%) and tetracycline (10,8%). The presence of Salmonella and thermo-tolerant coliforms in superficial and underground water was frequently associated, but E.coli was not isolated in ten occasions. Rappaport-Vassiliadis enrichment broth was more efficient than Selenite Cystine for the isolation of Salmonella when kept at 42,5ºC. The serotypes isolated from sewage closely resembled the isolates originated from human fecal cultures during the same period. The results show the dissemination of Salmonella in aquatic environments in the State of Pará and the risk to the health of the human population.

Navegar

Navegando Teses em Biologia de Agentes Infecciosos e Parasitários (Doutorado) - PPGBAIP/ICB por CNPq "CNPQ::CIENCIAS BIOLOGICAS::MICROBIOLOGIA::BIOLOGIA E FISIOLOGIA DOS MICROORGANISMOS::BACTEROLOGIA"