Influenza A subtype H3N2 is associated with an increased risk of hospital dissemination - an observational study over six influenza seasons.

BACKGROUND: Previous studies on hospital-acquired influenza (HAI) have not systematically evaluated the possible impact of different influenza subtypes. HAI has historically been associated with high mortality, but clinical consequences may be less severe in a modern hospital setting. AIMS: To identify and quantify HAI for each season, investigate possible associations with varying influenza subtypes, and to determine HAI-associated mortality. METHODS: All influenza-PCR-positive adult patients (>18 years old) hospitalized in Skåne County during 2013-2019, were prospectively included in the study. Positive influenza samples were subtyped. Medical records of patients with suspected HAI were examined to confirm a nosocomial origin and to determine 30-day mortality. RESULTS: Of 4110 hospitalized patients with a positive influenza PCR, 430 (10.5%) were HAI. Influenza A(H3N2) infections were more often HAI (15.1%) than influenza A(H1N1)pdm09, and influenza B (6.3% and 6.8% respectively, P<0.001). The majority of HAI caused by H3N2 were clustered (73.3 %) and were the cause of all 20 hospital outbreaks consisting of ≥4 affected patients. In contrast, the majority of HAI caused by influenza A(H1N1)pdm09 and influenza B were solitary cases (60% and 63.2%, respectively, P<0.001). Mortality associated with HAI was 9.3% and similar between subtypes. CONCLUSIONS: HAI caused by influenza A(H3N2) was associated with an increased risk of hospital dissemination. Our study is relevant for future seasonal influenza infection control preparedness and shows that subtyping of influenza may help to define relevant infection control measures. Mortality in HAI remains substantial in a modern hospital setting.

Increased risk of severe maternal morbidity (near-miss) among immigrant women in Sweden: a population register-based study.

OBJECTIVE: To determine if immigrant women from low-, middle- and high-income countries have an increased risk of severe maternal morbidity (near-miss) when they deliver in Sweden. DESIGN: Population register-based study. SETTING: Nationwide study including all singleton deliveries (≥28 weeks of gestation) between 1998 and 2007. POPULATION: Women with a near-miss event; all women with a singleton delivery ≥28 weeks of gestation during the same period acted as reference group. METHODS: Near-miss was defined by a combined clinical and management approach with use of International Classification of Diseases, 10th revision codes for severe maternal morbidity. A woman's country of origin was designated as low-, middle- or high-income according to the World Bank Classification of 2009. Unconditional logistic regression models were used in the analysis. MAIN OUTCOME MEASURES: Maternal near-miss frequencies per 1000 deliveries and odds ratios with 95% confidence intervals. RESULTS: There were 914 474 deliveries during the study period and 2655 near-misses (2.9 per 1000 deliveries). In comparison to Swedish-born women, those from low-income countries had an increased risk of near-miss (odds ratio 2.3, 95% confidence interval 1.9-2.8) that was significant in all morbidity groups except for cardiovascular diseases and sepsis. Women from middle- and high-income countries showed no increased risk of near-miss. CONCLUSIONS: Women from low-income countries have an increased risk of maternal near-miss morbidity compared with women born in Sweden. Although the rate is low it should alert healthcare providers.

Priorities in emergency obstetric care in Bolivia--maternal mortality and near-miss morbidity in metropolitan La Paz.

OBJECTIVE: To document the frequency and causes of maternal mortality and severe (near-miss) morbidity in metropolitan La Paz, Bolivia. DESIGN: Facility-based cross-sectional study. SETTING: Four maternity hospitals in La Paz and El Alto, Bolivia, where free maternal health care is provided through a government-subsidised programme. POPULATION: All maternal deaths and women with near-miss morbidity. METHODS: Inclusion of near-miss using clinical and management-based criteria. MAIN OUTCOME MEASURES: Maternal mortality ratio (MMR), severe morbidity ratio (SMR), mortality indices and proportion of near-miss cases at hospital admission. RESULTS: MMR was 187/100,000 live births and SMR was 50/1000 live births, with a relatively low mortality index of 3.6%. Severe haemorrhage and severe hypertensive disorders were the main causes of near-miss, with 26% of severe haemorrhages occurring in early pregnancy. Sepsis was the most common cause of death. The majority of near-miss cases (74%) were in critical condition at hospital admission and differed from those fulfilling the criteria after admission as to diagnostic categories and socio-demographic variables. CONCLUSIONS: Pre-hospital barriers remain to be of great importance in a setting of this type, where there is wide availability of free maternal health care. Such barriers, together with haemorrhage in early pregnancy, pre-eclampsia detection and referral patterns, should be priority areas for future research and interventions to improve maternal health. Near-miss upon arrival and near-miss after arrival at hospital should be analysed separately as that provides additional information about factors that contribute to maternal ill-health.