Lower Limb Paralysis Associated with Chikungunya in Kinshasa, the Democratic Republic of the Congo: Survey Report.

Polio-associated paralysis is one of the diseases under national surveillance in the Democratic Republic of the Congo (DRC). Although it has become relatively rare due to control measures, non-polio paralysis cases are still reported and constitute a real problem, especially for etiological diagnosis, which is necessary for better management and response. From September 2022 to April 2023, we investigated acute flaccid paralysis (AFP) cases in Kinshasa following an alert from the Provincial Division of Health. All suspected cases and their close contacts were investigated and sampled. Among the 57 sampled patients, 21 (36.8%) were suspects, and 36 (63.2%) were contacts. We performed several etiological tests available in the laboratory, targeting viruses, including Poliovirus, Influenza virus, SARS-CoV-2, Enterovirus, and arboviruses. No virus material was detected, but the serological test (ELISA) detected antibodies against Chikungunya Virus, i.e., 47.4% (27/57) for IgM and 22.8% (13/57) for IgG. Among suspected cases, we detected 33.3% (7/21) with anti-Chikungunya IgM and 14.3% (3/21) of anti-Chikungunya IgG. These results highlight the importance of enhancing the epidemiological surveillance of Chikungunya.

Sustained social withdrawal behavior and 'difficult' temperament among infants, in relation to maternal affectivity in a low-income area of Kinshasa, Democratic Republic of Congo.

Little is known about the relationship between maternal affectivity, social withdrawal and temperament in infants in low-income countries. The goal of the study was to assess the prevalence of social withdrawal behavior in infants aged 8 ± 2.3 months and to explore associations between maternal affectivity during pregnancy and postpartum, infant social withdrawal (as a sign of stress) and 'difficult' temperament as assessed by the mothers. 458 mother-infant dyads were recruited in the city's public mother and child health-care centers. The eight items of the Alarm Distress Baby scale (8-ADBB) and the five-item M (modified) ADBB (M-ADBB) were used to assess sustained withdrawal behavior (ISSWB). The Goldberg Depression and Anxiety Scales were used to assess maternal affectivity and mental well-being. A specially designed questionnaire was used to identify stressful events faced by the mother during pregnancy. The ELDEQ-QCB was used to assess the degree of difficulty in managing the baby. Using the M-ADBB, we found a striking figure of 69.2% for ISSWB with 8-ABB (range 0-29) and 72.7% with the M-ADBB (range 0-10). ISSWB was linked to negative maternal affectivity and to high incidence of stressful events for the mothers, and to the child being viewed as 'difficult' by the mother. Positive prenatal affectivity was a protective factor of ISSWB (OR 0.46). Results are compared with previous studies in Africa. Early screening for ISSWB and identification of factors affecting maternal mental well-being could help in early intervention and increase the chances of better child development.

DNA methylation patterns associated with konzo in Sub-Saharan Africa.

Konzo, a disease characterized by sudden, irreversible spastic paraparesis, affecting up to 10% of the population in some regions of Sub-Saharan Africa during outbreaks, is strongly associated with dietary exposure to cyanogenic bitter cassava. The molecular mechanisms underlying the development of konzo remain largely unknown. Here, through an analysis of 16 individuals with konzo and matched healthy controls from the same outbreak zones, we identified 117 differentially methylated loci involved in numerous biological processes that may identify cyanogenic-sensitive regions of the genome, providing the first study of epigenomic alterations associated with a clinical phenotype of konzo.

Concurrent exposure to heavy metals and cognition in school-age children in Congo-Kinshasa: A complex overdue research agenda.

The impact of concurrent exposure to neurotoxic metals is a significant threat to brain function, mostly in contexts of multiple exposures as seen in the developing world. Ninety-five children (46 boys and 49 girls, 6 to 11-year old) from Congo-Kinshasa were assessed for cognition using the Kaufman Assessment Battery for Children (2nd edition) and exposure to Cr, Cu, Zn, Co, Mn, As, Cd, Se, Hg, Fe, and Pb by inductively coupled plasma mass spectrometry (ICPMS) in serum and urine collections. Concentrations of elements were all above normal ranges except for Cd, Se and Hg. General linear mixed effects models were used to predict neurocognitive outcomes with variable selection methods including backward elimination, elastic net, or subsets identified based on subject matter expertise. After adjusting for sex, age, and SES, urinary Co > 5 µg/l was associated with poor simultaneous processing (memory) (p = 0.0237). Higher excretion but normal concentration of Cd in serum was associated with better memory (p = 0.03), planning (p = 0.05), and overall performance scores (p < 0.01); thus appeared to be neuroprotective. However, higher excretion of Zn had negative influence on the overall performance scores (p = 0.02). Predictive neurotoxicology is a challenging task in contexts of multiple and concurrent exposures. Urinary Co > 5 µg/l is a risk factor for poor neurodevelopmental outcomes in such contexts. The impact of heavy metals on cognition is dependent on concentrations of and interactions between toxic and essential elements.