Among the close contacts of the patient, one contact developed fever and cough after the onset of illness in the case. Specimens collected from all household contacts, including the symptomatic contact, were negative for influenza A viruses.
Between 4 September to 7 November 2020, a total of 214 people were sampled and their samples have been sent to the INRSP for laboratory testing with a total of 75 testing positive for RVF (RT-PCR and serology by enzyme-linked immunosorbent assay (ELISA). Positive cases have been reported in 11 of 15 regions of the country: Brakna, Trarza, Gorgol, (on the border with Senegal), Adrar, Assaba, Hodh El Gharby, Hodh El Chargui, Guidimaka (on the border with Mali) and Nouakchott Sud, Nouakchott Ouest and Tagant. The Tagant region is the most affected (38/75, 51%) with principal hotspot districts being Tidjikja and Moudjeria. Thus far a total of 25 deaths have been reported from this outbreak.
In September 2020, the Institut Pasteur de la Guyane (IPG) (member of the French National Reference Laboratory for arboviruses) identified two cases of Mayaro virus infection (MAYV) confirmed by reverse transcriptase polymerase chain reaction (RT-PCR) and one probable case found positive for Mayaro antibodies. The case-patients presented dengue-like symptoms and joint pains, and tested negative for dengue by RT-PCR.
Among the 37 clinically-compatible cases, most cases are male (60%) and the median age is 36 years (range 3-82 years). The most represented age range is 15 to 54-years-old (19 cases) followed by 0 to 14-years-old (10 cases). A peak of cases was observed in mid-September however, the outbreak investigation remains ongoing.
During the same period in 2019, 3,794 suspected cases and 73 deaths (CFR 1.9%) were reported in 120 health zones from 16 provinces while a total of 2,850 suspected cases (CFR 2.1%) were reported in 2018.
The case-patient had severe disability, and developed dengue-like symptoms on 12 July. On 16 July, he was hospitalized in an intensive care unit in Cayenne, French Guiana, with consciousness disorders and acute liver failure, and died on 19 July.
From 11 June though 15 July, six out of 22 health areas have been affected within Rethy health zone (11 villages), with a total of 45 cases including nine deaths (case fatality rate: 20%). All nine (9) cases who died presented with signs of headache, high fever, and painful nodes; four (4) out of the nine (9) cases had cough.