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Background: Pregnant women with influenza are more likely to have complications, but information on infant outcomes is limited. Methods: Five state/local health departments collected data on outcomes of infants born to pregnant women with 2009 H1N1 influenza reported to the Centers for Disease Control and Prevention from April to December 2009. Collaborating sites linked information on pregnant women with confirmed 2009 H1N1 influenza, many who were severely ill, to their infants’ birth certificates. Collaborators also collected birth certificate data from two comparison groups that were matched with H1N1-affected pregnancies on month of conception, sex, and county of residence. Results: 490 pregnant women with influenza, 1,451 women without reported influenza with pregnancies in the same year, and 1,446 pregnant women without reported influenza with prior year pregnancies were included. Women with 2009 H1N1 influenza admitted to an intensive care unit (ICU; n = 64) were more likely to deliver preterm infants (<37 weeks), low birth weight infants, and infants with Apgar scores <=6 at 5 min than women in comparison groups (adjusted relative risk, aRR = 3.9 [2.7, 5.6], aRR = 4.6 [2.9, 7.5], and aRR = 8.7 [3.6, 21.2], for same year comparisons, respectively). Women with influenza who were not hospitalized and hospitalized women not admitted to the ICU did not have significantly elevated risks for adverse infant outcomes. Conclusions: Severely ill women with 2009 H1N1 influenza during pregnancy were more likely to have adverse birth outcomes than women without influenza, providing more support for influenza vaccination during pregnancy.

To evaluate the relationship between breast cancer risk and spontaneous and induced abortion, we conducted a detailed descriptive review of 32 epidemiologic studies that provided data by type of abortion and by various measures of exposure to abortion-number of abortions, timing of abortion in relation to first full-term pregnancy, length of gestation, and age at first abortion. Breast cancer risk did not appear to be associated with an increasing number of spontaneous or induced abortions. Our review also suggested that breast cancer risk probably was not related to the other measures of exposure to abortion, and probably did not differ by age or a family history of breast cancer. Finally, the data appeared to suggest a slightly increased risk among nulliparous women, but this tendency was based primarily on studies with a small number of nulliparous women who had had spontaneous or induced abortions. Definitive conclusions about an association between breast cancer risk and spontaneous or induced abortion are not possible at present because of inconsistent findings across studies. Future investigations should consider prospective designs, separate analyses of spontaneous and induced abortions, appropriate referent groups, and adequate adjustment for confounding and effect modification. Future investigations also should attempt to determine whether any increased risks reflect the transient increase in breast cancer risk hypothesized for full-term pregnancy or a causal relationship specific to spontaneous or induced abortion.

Diabetes (DM) is among the most common chronic diseases diagnosed in youth in the United States. In adults, a bi-directional relationship has been demonstrated between DM and mental, behavioral, and developmental disorders (MBDD). Such comorbidities may significantly impact the quality of life of patients with DM and disease management. However, little is known about the association of DM and MBDD in youth. To examine the magnitude of overlap between these chronic conditions, we calculated prevalence estimates using the 2016-2019 National Survey of Children’s Health, an annual, cross-sectional survey of non-institutionalized US children aged 0-17 years (N = 131,774). Parents were asked if their child was ever diagnosed with DM or with any of the following MBDDs: attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder, learning disability, intellectual disability, developmental delay, anxiety, depression, behavioral or conduct problems, Tourette syndrome, or speech disorder. We present crude prevalence estimates and predictive margins adjusted for age, sex, and race/ethnicity, both weighted to be representative of the US youth population. Among US youth, prevalence estimates were 0.45% (95%CI: 0.36-0.55) for DM and 22.7% (22.2-23.2) for any MBDD. Crude prevalence of any MBDD varied by DM status (DM: 43.7% [34.5-53.4]; no DM: 22.6% [22.1-23.1]). Compared with youth without DM, those with DM had a higher adjusted prevalence of any MBDD (prevalence ratio: 1.55 [1.20-2.00]) and individual MBDDs (p &lt;.05), except for ADHD, Tourette syndrome and speech disorder. These results suggest a significant health burden with more than 2 out of 5 youth with DM having any MBDD. Future work examining potential causal pathways could be beneficial. Understanding associated factors may ultimately lead to future preventative strategies for MBDD and DM in youth. Disclosure C. E. Barrett: None. K. M. Bullard: None. J. Park: None. A. Koyama: None. C. Mercado: None. A. H. Claussen: None. K. Newsome: None. M. E. Pavkov: None.

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