Evidence of the impact of monovalent rotavirus vaccine on childhood acute gastroenteritis hospitalization in Togo

BACKGROUND

Monovalent rotavirus vaccine (RV1) was introduced in the immunization schedule of Togo in June 2014. We evaluated the impact of rotavirus vaccines on acute gastroenteritis (AGE) and rotavirus-associated hospitalizations in Togolese children.

METHODS

Sentinel surveillance for AGE (defined as ≥3 liquid or semi-liquid stools/24 h lasting <7 days) hospitalizations among children <5 years of age was conducted in two sites in the capital city, Lome. ELISA was used for diagnosis of rotavirus infection in children with AGE. Additionally, review of hospitalization registers was performed at five hospitals to assess trends in AGE hospitalizations among children aged <5 years. For the vaccine impact assessment, pre-rotavirus vaccine introduction (July 2010-June 2014) and post-rotavirus vaccine introduction (July 2014-June 2016) periods were compared for annual changes in proportions of hospitalizations associated with AGE and rotavirus.

RESULTS

During the pre-vaccine period, sentinel surveillance showed that 1017 patients were enrolled and 57% (range, 53-62%) tested positive for rotavirus, declining to 42% (23% reduction) in the first post-vaccine year and to 26% (53% reduction) in the second post-vaccine year; declines were most marked among infants. The patient register review showed that, compared with pre-vaccine rotavirus seasons, declines in hospitalizations due to all-cause AGE during post-vaccine rotavirus seasons were 48% among <1 year age-group in both first and second years following vaccine introduction. Among 1-4 year olds no reduction was noted in the first year and a 19% decline occurred in the second year.

CONCLUSIONS

We report rapid and marked reduction in the number of AGE hospitalizations and the proportion of AGE hospitalizations attributable to rotavirus in the first two years post- RV1 implementation in Togo. It is necessary to monitor long-term vaccine impact on rotavirus disease burden through continued surveillance.

Chloroquine efficacy in the treatment of uncomplicated malaria at three sentinel sites in northern Togo

In Togo, chloroquine (CQ) remains the first-line drug for the treatment of uncomplicated, Plasmodium falciparum malaria. In the absence of recent data on the level of parasite resistance to antimalarial drugs, Togo's National Malaria Control Programme (NMCP) decided to assess the current efficacy of CQ in the treatment of uncomplicated, P. falciparum malaria at three sentinel sites in the north of the country. Between the September and November of 2001, the World Health Organization's standard 14-day protocol was used to investigate 153 malarious children aged 6-59 months old (46 from Sokode, 54 from Niamtougou and 53 from Dapaong). Of the subjects from Sokode, Niamtougou and Dapaong, early treatment failure was observed in 0%, 7% and 12%, late treatment failure in 0%, 11% and 17%, and overall parasitological failure in 0%, 45% [with a 95% confidence interval (CI) of 39%-51%] and 62% (CI=54%-70%), respectively. Even within northern Togo, there is clearly considerable geographical variation in the level of resistance to CQ. Before an efficient antimalarial-drug policy can be developed, there is an urgent need to develop and use the national surveillance system further, to collect relevant data on the efficacies of CQ and other antimalarial drugs, such as amodiaquine and sulfadoxine-pyrimethamine.

[Profile of Buruli ulcer treated at the National Reference Centre of Togo: a study of 119 cases]

The purpose of this study was to describe the epidemiological, clinical, therapeutic profile and the outcome of Buruli ulcer (BU) in the National Reference Center for Buruli ulcer treatment (NRCBUT) in Togo. It was a retrospective and descriptive study of records of patients treated for BU in the NRCBUT between June 2007 and December 2010. During the study period, 119 patients (56.3% males) were treated in the NRCBUT for BU. The median age of patients was 14 years. The proportion of children (< 15 years) was 56.3%. On admission, 85 patients were at ulcer stage and 34 patients at the pre-ulcer stage. BU wounds were mainly located on lower limbs (50.4%), followed by upper limbs (32.6%) and trunk (13.3%). The location of the wounds on the lower limbs were more frequent in patients older than 15 years (P < 0.001), while those on the upper limbs (P = 0.002) and trunk (P = 0.03) were more frequent in patients aged less than 15 years. All patients had received medical treatment which was based on rifampicin-streptomycin combination for eight weeks. This treatment was coupled to surgery in 30 cases. The outcome was punctuated by complications in 7 patients, limb amputation in 3 patients, and sequels in 10 patients. This study confirmed that the BU is the prerogative of young subjects and the exposed areas in the skin facilitates transmission. Apart from these classic features, some unique aspects including the age-dependent distribution are related to the pathogenesis of this disease.

[Knowledge, attitudes and practices of healthcare providers in Togo regarding prevention of mother-to-child transmission of HIV in 2010]

OBJECTIVE

To evaluate the knowledge, attitudes and practices of health care providers (HCP) in Togo regarding prevention of mother-to-child transmission of HIV (PMTCT).

METHOD

A cross-sectional study was conducted in 22 antenatal clinics with PMTCT programs from January 18 to February 6, 2010. Clinic selection was based on attendance and local factors. Data were collected through interviews conducted by 23 trained investigators.

RESULTS

A total of 97 HCP were interviewed at the 27 selected clinics. Most, i.e., 76%, had received PMTCT training. In terms of knowledge, interview data revealed the following strengths: 83% of HCP identified transmission from mother to child as the main route of HIV transmission in children < 15 years; 87% asserted that HIV-infected pregnant women do not always transmit HIV to their children; 77% knew that the ELISA test was performed after 18 months: and 96% had a clear notion about feeding infants born to HIV-infected mothers. Knowledge assessment revealed the following weaknesses: 30% of HCP had never heard of polymerase chain reaction; 27% said that confidentiality about HIV status was not always necessary; and 22% were unaware that decontamination of equipment using a chlorine solution kills HIV. In addition, interview data revealed the following positive attitudes and practices: 83% of HCP were willing to continue working in a center with a PMTCT program and 87% referred women pregnant for the HIV serology. On the negative side, however, only 27% of HCP summonsed husbands whose wives tested positive for HIV.

CONCLUSION

This investigation shows that the knowledge, attitudes and practices of HCP in Togo regarding PMTCT is fairly good. However, it also revealed several weaknesses that should be addressed by further training.

Genetic diversity and genotype multiplicity of Plasmodium falciparum infections in symptomatic individuals in the maritime region of Togo

OBJECTIVE

To assess the genotype prevalence and the multiplicity of Plasmodium falciparum infections in the maritime region of Togo.

METHODS

We enrolled 309 symptomatic individuals aged from 6 months to 15 years from Bè/Lomé and Tsévié, two malaria endemic zones. The number and the proportions of merozoite surface proteins 1, 2 and 3 genotypes in patients were determined using capillary electrophoresis genotyping. We further investigated the possible association between transaminases and homocysteine, and the severity of the disease.

RESULTS

Of the 309 samples genotyped, 210 tested positive to msp-1, 227 to msp-2 and 193 to msp-3. The nested PCR revealed 22 different alleles for the allelic family msp-1, 33 for msp-2 and 13 for msp-3. At each locus, the family distribution was 54.58% of K1, 25% of MAD20 and 20.42% of RO33 for msp-1, and 51.71% and 48.29% of FC27 and 3D7, respectively, for msp-2. For all these allelic variants, the distribution was associated with neither the severity of malaria nor the zone of habitation. Pearson correlation coefficients between either the levels of homocysteine or the transaminase and the severity of the disease were very low.

CONCLUSION

The severity of malaria was not associated with higher multiplicity of infections and did not appear restricted to particular genotypes. More comprehensive explorations including immunity, genetic factors, nutritional and sociologic status of the population could clarify the situation.

[Evaluation of the glycemia of low-weight newborns within the 24th hour of life at Lomé University Hospital (Togo)]

OBJECTIVE

To assess the glycemia of low-weight newborns (LWNBs) during their first 24h of life as well as their mother's glycemia.

PATIENTS AND METHOD

This was a cross-sectional prospective study within a case-control group, conducted at Lomé University Hospital (nationwide main hospital) from January to May 2006. One hundred thirty-nine LWNBs and 150 eutrophic term newborns (ETNBs), 98 mothers of LWNBs (MLWNBs), and 145 mothers of ETNBs (METNBs) were screened and monitored on glycemia dosage.

RESULTS

The average glycemia level of the LWNBs (0.34 ± 0.27g/l) was significantly greater than the ETNBs' glycemia level (0.30 ± 0.14 g/l); it was nearly the same for the mean glycemia level of the MLWNBs (0.82 ± 0.2g/l) and the METNBs (0.77 ± 0.1g/l). Neonatal hypoglycemia during the first 24h of life was less frequent (RR=0.8) in the LWNBs (61.15%) than in the ETNBs (80%). The positive correlation between gestational age and glycemia was higher in the ETNBs (r=0.17) than in the LWNBs (r=0.07). This positive correlation between birthweight and glycemia was lower in the LWNBs (r=0.17) compared to the ETNBs (r=0.37); this was not the case within the group of the ETNBs (r=0.02) compared to the group of the LWNBs (r=0.34) concerning the correlation between the glycemia of mothers and newborns.

CONCLUSION

The early hypoglycemia was much greater in the ETNBs compared to the LWNBs. Therefore, it is necessary to systematically start breastfeeding all newborns within their first hours of life whatever their gestational age, in order to solve these metabolic disorders.

[Treatment of children born of AIDS mothers in Tsevie hospital regional center, Togo]

The aim of this survey was to describe the components of the children medical care follow-up in the protocol of prevention of HIV/Aids from mother to child by nevirapine intake. A four-year retrospective study was carried out in Tsevie hospital regional center 90 children and their pregnant mothers who received nevirapine were recorded. 75 children received breast feeding. There was no follow-up for 42% of the children. The weight growth was correct in 90% of the children effectively followed. 49% of the children were completely vaccinated to PEV. The average children medical check up was 3.1 (minimum 1 maximum 8). The average age for breast feeding weaning was 6.2 months. The mother to child transmission rate was globally estimated at 12.5% at 18 months. 12 children (13%) died before HIV serology. The survey confirms the potency of nevirapine in preventing HIV transmission from mother to child and lays emphasis on real problems for which appropriate solutions should be found.