Influenza 2014–2015 among pregnant Japanese women: primiparous vs multiparous women

Abstract

Objectives: This study was performed to determine whether multiparous pregnant women are prone to influenza. Methods:A questionnaire survey was conducted at 19 centres located throughout Japan, targeting all 6694 postpartum women within 7 days after birth before leaving the hospital. All women gave birth during the study period between March 1, 2015, and July 31, 2015. Data regarding vaccination and influenza infection in or after October 2014, age, previous experience of childbirth, and number and ages of cohabitants were collected.Results: Seventy-eight percent (n = 5,197) of women given questionnaires responded.Of these, 2,661 (51%) and 364 (7.0%) women reported having been vaccinated and having contracted influenza, respectively. Multiparous women had a higher risk of compared to primiparous women. The risk of influenza increased with increasing number of cohabitants: 4.8% (100/2,089), 7.5%, (121/1,618), 9.0%, (71/785), and 10.4% (58/557) for women with 1, 2, 3, and ≥ 4 cohabitants, respectively. Conclusions:Family size is a risk factor for influenza infection in pregnancy.

Risk Factors Associated with Outcomes of Seasonal Influenza in Pregnant Women Referring to Healthcare Centers in Iran in 2015 - 2016

“…In a study by Yamada et al in Japan, multiparous women had a higher risk of influenza regardless of vaccination status than primiparous women (20). Likewise, in the present study, we found that parity was a significant factor affecting the consequence of influenza during pregnancy.…”

Maternal influenza vaccination relates to receiving relevant information among pregnant women in Japan

“…Yamada et al reported that the vaccination coverage of pregnant women was approximately 50% in the 2013-2014 and 2014-2015 influenza seasons in Japan. 11,12 In the current study, approximately half of pregnant women (53.5% in 2017 and 47.4% in 2018) were vaccinated for seasonal influenza. Although the influenza vaccination is voluntary and not a routine vaccination, most pregnant women surveyed knew that the influenza vaccination was available for pregnant women in Japan.…”

“…However, the proportional influenza vaccine uptake was similar to that reported in a previous study. 11,12 Third, although the questionnaire in the current study included 10 questions, there are many factors that could potentially influence vaccine uptake. We focused on the key individuals who provided information via their recommendations in this study.…”

“…10 In contrast, according to a pilot survey among 11 hospitals conducted during the 2013-2014, 2014-2015 influenza season, 51% of pregnant women were vaccinated for influenza. 11,12 Thus, pregnant Japanese women can actively choose to receive the influenza vaccination.…”

Cost-effectiveness of baloxavir marboxil compared with laninamivir for the treatment of influenza in patients at high risk for complications in Japan

“…Real-world evidence on the prevalence of HRC in the elderly was not available; for this reason, consistency between estimates was assured by applying the age-dependent increase of HRC prevalence based on a JammNet database analysis and the published literature. Additional sources were needed to retrieve data for two highrisk groups that were not covered in JammNet: women 2 weeks postpartum and residents of long-term care facilities [17][18][19][20] . The ratio of the elderly with HRC to adults with HRC was 2.55, and the prevalence of HRC in the elderly was estimated at 49%.…”