Developing a Vaccine for Rheumatic Fever and Rheumatic Heart Disease: A Review of Current Research Strategies and Challenges

Rheumatic heart disease (RHD) is an auto immune sequelae of rheumatic fever (RF) caused by Group A Streptococcal (GAS) pharyngitis, rather than the direct bacterial infection of the heart, which leads to chronic heart valve damage. Although antibiotics like penicillin are effective against GAS infection, improper medical care such as poor patient compliance, overcrowding, poverty, and repeated exposure to GAS, leads to acute rheumatic fever and RHD. Thus, effort to design a vaccine based on emm gene identification of GAS, M-protein going on for more than 40 years, is unlikely to succeed. M-protein is strain specific. Infection with one strain does not provide immunity from infection with another strain. Based on the emm gene identification, of 250 or more identified strains of GAS, the distribution is heterogenous and keeps changing. The M-protein gene sequence of the organism tends to mutate. A vaccine prepared from available strains may not be effective against a strain following mutation.

The association of plasma high-sensitivity C-reactive protein level with rheumatic heart disease: The possible role of inflammation

Background Currently, it is not clear whether recurrent traumatic events lead to progression of rheumatic heart disease (RHD) after the incident of acute rheumatic fever or a persistent inflammatory state at the site of the valves. The aim of this study was to assess the possible association between plasma high sensitive C Reactive Protein (hs-CRP) level as an indicator of inflammation and RHD. Materials & methods Ninety patients with RHD and 90 healthy controls who had undergone complete echocardiographic examination were enrolled in this cross-sectional study. A score was given to each patient according to the severity of valvular involvement. Plasma hs-CRP level was checked for each patient by ELISA method twice with two-week interval, and the mean hs-CRP was calculated. Results The mean plasma hs-CRP level in the case group was significantly higher compared to its level in the control group (2.59 ± 4.82 and 0.55 ± 0.43 in the case and control groups respectively, p < 0.001). There was also a strong association between the level of plasma hs-CRP and the severity of rheumatic valvular involvement (p < 0.001). Conclusion The mean plasma hs-CRP level seems to have a significant association with RHD and its severity. Further studies are needed to determine the cause and effect relationship.

Clinical Profile and Factors Related to Compliance with Benzathine Penicillin G Prophylaxis among RF/RHD Patients at the Tarlac Provincial Hospital, Philippines.

Rheumatic fever (RF) and Rheumatic heart disease (RHD), despite a documented decrease in their incidence, remain as problems in both industrialized and industrializing countries even at the beginning of the 21st century. The most devastating effects are on children and young adults in their most productive years. To determine the clinical profiles of RF/RHD patients at Pediatric Department of Tarlac Provincial Hospital, Tarlac city, Philippines and the factors related to their compliance with Benzathine Penicillin G Prophylaxis treatment, the ex post-facto research was done using the charts of patients. Out patients and ward patients diagnosed with RF/RHD patients were identified using the Jones Criteria. They served as the subjects of the study. The onset of the RF/RHD was seen in age ranging from 6 years to 17 years old with most of them occurring at 7-15 age range. The male to female ratio was 1.3:1. The RF/RHD patients came from different towns of Tarlac, the most number of which came from the city of Tarlac. The patients, being clientele of a provincial and non- paying hospital, came from poor family with low educational attainment, and low monthly income from skilled or unskilled work. Carditis (55% of the 58 cases) and polyarthritis (43%) were the most frequent manifestations seen among patients. In the minor manifestations of RF, majority had episodes of acute tonsillopharyngitis (82%) and fever (82%). Laboratory results, showed abnormal ESR (55 or 95% of the 58 cases), ASO titers (47 or 81%), PR intervals (18 or 31%), and leukocytosis (30 or 67%). Of the 26 cases who had valvular involvement cases, 7 mitral regurgitation; 2 (7%) had mitral stenosis; and 1 had aortic regurgitation. The rest had combination or triple combinations of valvular involvement. Compliance with Benzathine Penicillin G treatment was 46.6%. Compliance to treatment is related to the occupation of father (x2= 6.643, significant at .0361 level) and family income (x2= 8.088, significant at .0175 levels. Poor families who have low paying jobs are less likely to complete the treatment of their sick children. The Department of Health must find ways to provide the secondary chemoprophylaxis to RF/RHD patients for free to improve the compliance rate, thus, provide bigger chance for the RF/RHD patients to survive their disease.