Highlights

• Since Week 40, influenza and influenza-like illness activity has been consistent with what is typically observed at this time of year in the emergency departments of the OSCOUR® network in Lorraine and among the SOS Médecins association in Meurthe-et-Moselle. In Week 45, 8 and 2 diagnoses were made by emergency department physicians and the association, respectively. A single case of a positive influenza A test result was identified in week 42.

• Surveillance of severe influenza cases hospitalized in intensive care began in week 45. Its rationale, objectives, and methodology are described on page 3. To date, no severe cases have been reported in Lorraine. Only one case has been reported in mainland France.

• Since week 37, activity in the emergency departments of the OSCOUR® network in Lorraine related to bronchiolitis has been consistent with what is typically observed, although weekly increases were noted in weeks 41 and 44. In week 45, emergency department physicians made 26 diagnoses of bronchiolitis, which accounts for 4.1% of cases among children under 2 years of age. For the SOS Médecins association in Meurthe-et-Moselle, this activity has remained within expected ranges since week 37. In week 45, with 3 diagnoses of bronchiolitis, this activity accounted for 4% of total activity among children under 2 years of age.

• According to virological data from the Nancy University Hospital, the number of positive respiratory virus tests has remained stable since week 43. Two types of viruses are primarily detected: respiratory syncytial virus (RSV) and parainfluenza virus.

• In Lorraine, activity related to gastroenteritis in the emergency departments of the OSCOUR® network and within the SOS Médecins association in Meurthe-et-Moselle remains stable compared to previous years. With 101 diagnoses made in week 45, this activity accounted for 0.9% of all diagnoses in emergency departments. Doctors from the SOS Médecins association in Meurthe-et-Moselle made 57 diagnoses of gastroenteritis and diarrhea, accounting for 6.5% of all diagnoses.

• The number of positive test results for circulating enteric viruses remains stable according to data from the Nancy University Hospital. Adenovirus and rotavirus are currently the two most frequently detected viruses.

• According to available data, no unusual increase in mortality has been observed in Lorraine over the past few weeks. Since the time lag in reporting death data exceeds 7 days, data for week 45 are currently being consolidated.