Distribution of Streptococcus pneumoniae serotypes in the northeast macro-region of São Paulo state/Brazil after the introduction of conjugate vaccine

BMC Infectious Diseases

Maria Luiza Leopoldo Silva Guerra¹  Samanta Cristine Grassi Almeida¹  Marta Inês Cazentini Medeiros²  Paulo da Silva³  Ana Maria Machado Carneiro³  Denise de Andrade⁴ 

[1] Bacteriologic Center of Instituto Adolfo Lutz Central–São Paulo;Regional Laboratory Center of Instituto Adolfo Lutz - Ribeirão Preto and student at College of Nursing at University of São Paulo - Ribeirão Preto;Regional Laboratory Center of Instituto Adolfo Lutz - Ribeirão Preto;Ribeirão Preto College of Nursing at University of São Paulo - Ribeirão Preto;

关键词: Streptococcus pneumoniae;    pneumococcus;    serotype;    conjugate vaccine;   

DOI  :  10.1186/s12879-017-2696-y

来源: DOAJ

【 摘 要 】

Abstract Background Infections caused by Streptococcus pneumoniae (Spn) still challenge health systems around the world, even with advances in vaccination programs. The present study evaluated the frequency of various Spn serotypes isolated in Regional Health Care Network 13 (RRAS 13), which includes the regional health departments (RHDs) of Araraquara, Barretos, Franca and Ribeirão Preto, especially after the introduction of 10-valent pneumococcal conjugate vaccine (PCV10) in 2010. Methods The analyzed Spn strains were isolated from patients with invasive pneumococcal diseases (IPDs) and then sent to Adolfo Lutz Institute (ALI) for further confirmative identification tests during the period from 1998 to 2013. The samples were from the cities in RRAS13, which is located in the Northeast region of São Paulo State, and totals 90 municipalities. Results We analyzed strains isolated from 796 patients. They were predominantly: men (58.9%); 20 to 60 years old (32.2%); evaluated from 2003 to 2010 (60.2%); and diagnosed with meningitis (45.7%) and pneumonia (45.0%), the most common invasive pneumococcal diseases. In 2010, serotypes 3, 19F, 1, 23F, 6A and 6B were among the most frequent, while serotypes 3, 12F, 14, 6A, 18C, 8 and 6B were more common after the introduction of PCV10. Serotypes 14, 19F and 3 were more frequent in meningitis, while serotypes 14, 3 and 1 prevailed in pneumonia. After 2010, there was a decrease in serotypes 14, 1, 23F and 5 and an increase in serotypes 3, 12F, 11A and 8, which were not present in the vaccine. Conclusions The present study noted the increase in serotypes 3, 12F, 11A and 8 after vaccination. None of those serotypes are included in the available conjugate vaccines, which highlights the importance of continued monitoring of IPDs in order to measure the disease burden in the population in the long term and provide new epidemiological information to determine the impact of PCV10 in Brazil.

【 授权许可】

Unknown