Determinants of non-vaccination against seasonal influenza during pregnancy.

OBJECTIVE: The objective of this study was to identify the determinants of influenza non-vaccination during pregnancy in Canada. METHODS: Biological mothers of children born between December 2018 and March 2019 were surveyed about vaccinations they had received during pregnancy, reasons for non-vaccination, obstetrical history, and demographics. Simple and multiple logistic regression models were used to measure associations between various sociodemographic factors as well as obstetrical history, and non-vaccination against influenza. We analyzed data from 2361 mothers. RESULTS: Factors associated with non-vaccination included being followed during pregnancy by a midwife compared to by an obstetrician-gynecologist (OR 2.02; 95% CI, 1.17‒3.50); having two or more past live births compared to none (OR 1.58; 95% CI, 1.01‒2.49); having an education level below high school diploma compared to a bachelor's degree or above (OR 2.50; 95% CI, 1.06‒5.90); and having a household income below $60,000 (OR 2.46; 95% CI, 1.42‒4.24) or between $60,000 and $99,999 (OR 2.77; 95% CI, 1.70‒4.52) compared to a household income of $140,000 or more. The province or territory of prenatal care proved to be an important factor in non-vaccination, with statistically significant odds ratios for certain provinces: OR 7.50 (95% CI, 1.40‒40.26) for Ontario, 8.23 (95% CI, 1.53‒44.23) for Newfoundland and Labrador, and 11.39 (95% CI, 2.14‒60.60) for Quebec, as compared to the territories. CONCLUSION: Despite universal access to influenza vaccines in Canada during pregnancy, regional variations and socioeconomic disparities in non-vaccination are still observable.

RéSUMé: OBJECTIF: Identifier les déterminants de la non-vaccination contre la grippe pendant la grossesse au Canada. MéTHODES: Notre étude porte sur 2 361 mères biologiques d'enfants nés entre décembre 2018 et mars 2019 qui ont été interrogées sur les vaccins reçus pendant leur grossesse, les raisons de non-vaccination, leurs antécédents obstétricaux, et leurs caractéristiques démographiques. Des modèles de régression logistique simple et multiple ont été utilisés pour mesurer les associations entre divers facteurs sociodémographiques, les antécédents obstétricaux, et la non-vaccination contre l'influenza. RéSULTATS: Les facteurs associés à la non-vaccination comprennent le suivi de grossesse par une sage-femme par rapport à un obstétricien-gynécologue (RC 2,02; IC 95% : 1,17‒3,50); avoir eu deux naissances vivantes ou plus par rapport à aucune (RC 1,58; IC 95% : 1,01‒2,49); avoir une scolarité inférieure au diplôme d'études secondaires par rapport à un baccalauréat ou plus (RC 2,50; IC 95% : 1,06‒5,90); et avoir un revenu du ménage inférieur à 60 000 $ (RC 2,46; IC 95% : 1,42‒4,24) ou entre 60 000 $ et 99 999 $ (RC 2,77; IC 95% : 1,70‒4,52) par rapport à un revenu ménager de 140 000 $ ou plus. La province ou le territoire de soins prénataux s'est avéré un facteur important de la non-vaccination avec des rapports de cote statistiquement significatifs pour certaines provinces : RC 7,50 (IC 95% : 1,40‒40,26) pour l'Ontario, 8,23 (IC 95% : 1,53‒44,23) pour Terre-Neuve-et-Labrador, et 11,39 (IC 95% : 2,14‒60,60) pour le Québec, comparativement aux territoires. CONCLUSION: Malgré l'accès universel aux vaccins antigrippaux au Canada durant la grossesse, des variations régionales et des disparités socioéconomiques en non-vaccination persistent.

Pertussis Non-Vaccination During Pregnancy Despite Advice From Prenatal Care Providers.

OBJECTIVE: The purpose of this study was to measure the proportion of non-vaccination for pertussis in mothers in Canada who had been advised by their prenatal care provider to get vaccinated, and to identify sociodemographic factors and beliefs associated with non-vaccination. METHODS: The Survey on Vaccination during Pregnancy (part of childhood National Immunization Coverage Survey) included biological mothers of children born from September 2018 to March 2019. This analysis was restricted to 2657 mothers who had been advised by their prenatal care provider to get vaccinated against pertussis during pregnancy and knew whether or not they had been vaccinated. RESULTS: Of those who had been advised to get vaccinated against pertussis, 21% were not. This rate varied across provinces and territories, ranging from 9% in Prince Edward Island to 32% in Newfoundland and Labrador. Factors independently associated with pertussis non-vaccination included lower household income, having had past live births, and having received prenatal care from an obstetrician-gynecologist or a midwife compared to a family doctor. The risk of pertussis non-vaccination despite prenatal care advice was higher for those who disagreed that the baby would be at greater risk of pertussis if the mother did not get vaccinated. It was also higher for those who disagreed with statements regarding perceived benefits of vaccination. Conversely, disagreement with statements on perceived barriers was negatively associated with pertussis non-vaccination. CONCLUSION: These findings highlight the underlying factors associated with non-vaccination against pertussis despite prenatal care provider recommendation. Some inaccurate beliefs about pertussis and vaccination during pregnancy persist, leading to non-vaccination.

Sociodemographic Disparities in COVID-19 Vaccine Uptake and Vaccination Intent in Canada.

Introduction: This study's objective was to examine sociodemographic disparities in COVID-19 vaccine uptake and vaccination intent in the Canadian provinces by identifying factors associated with vaccine uptake in seniors prioritized for vaccination at the time of the survey and vaccination intent in all adults. Data and methods: A cross-sectional survey of Canadian adults was conducted in all provinces from mid-April to mid-May 2021. In addition to sociodemographic characteristics, respondents (n=10,678) provided information on their COVID-19 vaccination status or their intent to get vaccinated. Logistic regression models were fitted using sociodemographic factors as explanatory variables and vaccination status (unvaccinated vs at least one dose) or vaccination intent (unlikely versus likely or already vaccinated) as outcomes. To account for vaccine prioritization groups, multiple regression models were adjusted for province of residence, age, Indigenous identity and health care worker status. Results: Seniors with a lower household income (less than $60,000) and those living in smaller communities (fewer than 100,000 inhabitants) had higher odds of being unvaccinated. Among Canadian adults, the odds of being unlikely to get vaccinated were higher for males (adjusted odds ratio [AOR] 1.3), individuals younger than 60 (AOR between 3.3 and 5.1), non-health care workers (AOR 3.3), those with less than a high school education (AOR 3.4) or a household income of less than $30,000 (AOR 2.7) and individuals who do not identify as South Asian, Chinese, Black, Filipino, Arab, Latin American, Southeast Asian, West Asian, Korean or Japanese (AOR 1.7). Interpretation: COVID-19 vaccine uptake (80%) and vaccination intent (95%) were high among Canadians; however, relative disparities were observed among specific groups. Continued efforts targeted toward these groups are essential in reducing potential inequity in access or service provision.

Pertussis Vaccination in Canadian Pregnant Women, 2018-2019.

OBJECTIVE: This study was undertaken to measure the uptake of pertussis vaccination during pregnancy in Canada and to identify sociodemographic factors associated with non-vaccination. METHODS: A total of 5091 biological mothers of children born between September 2, 2018, and March 1, 2019, were interviewed about pertussis vaccination during their pregnancy. RESULTS: Among 4607 mothers who recalled whether they had been vaccinated for pertussis, 43% had been vaccinated and 57% had not. The main reason given by mothers for not having been vaccinated was not being aware that pertussis vaccination was recommended. Factors independently associated with non-vaccination were being born outside Canada, lower household income, living in a province or territory where pertussis vaccination was not provided free of charge, having had previous live births, and having received maternity care from a midwife. CONCLUSION: Advice from the maternity care provider is an important driver of pertussis vaccination during pregnancy.