Early Childhood Antibiotic Treatment for Otitis Media and Other Respiratory Tract Infections Is Associated with Risk of Type
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Diabetes Care Volume 43, May 2020 991 Mona-Lisa Wernroth,1,2 Katja Fall,3,4 Early Childhood Antibiotic Bodil Svennblad,5 Jonas F. Ludvigsson,4,6 Arvid Sjolander,¨ 4 Catarina Almqvist,4,7 and Treatment for Otitis Media and Tove Fall1 Other Respiratory Tract Infections Is Associated With Risk of Type 1 Diabetes: A Nationwide Register- Based Study With Sibling Analysis EPIDEMIOLOGY/HEALTH SERVICES RESEARCH Diabetes Care 2020;43:991–999 | https://doi.org/10.2337/dc19-1162 OBJECTIVE The effect of early-life antibiotic treatment on the risk of type 1 diabetes is debated. This study assessed this question, applying a register-based design in children up to age 10 years including a large sibling-control analysis. RESEARCH DESIGN AND METHODS All singleton children (n 5 797,318) born in Sweden between 1 July 2005 and 1 30 September 2013 were included and monitored to 31 December 2014. Cox Molecular Epidemiology, Department of Med- ical Sciences, and Science for Life Laboratory, proportional hazards models, adjusted for parental and perinatal characteristics, Uppsala University, Uppsala, Sweden were applied, and stratified models were used to account for unmeasured con- 2Uppsala Clinical Research Center, Uppsala Uni- founders shared by siblings. versity, Uppsala, Sweden 3Clinical Epidemiology and Biostatistics, School RESULTS of Medical Sciences, Orebro¨ University, Orebro,¨ Sweden Type 1 diabetes developed in 1,297 children during the follow-up (median 4.0 years 4Department of Medical Epidemiology and Bio- [range 0–8.3]). Prescribed antibiotics in the 1st year of life (23.8%) were associated statistics, Karolinska Institutet, Stockholm, Sweden with anincreased risk oftype1diabetes(adjustedhazard ratio[HR]1.19[95%CI1.05– 5Department of Surgical Sciences, Uppsala Uni- versity, Uppsala, Sweden 1.36]), with larger effect estimates among children delivered by cesarean section 6 ¨ P 5 Department of Pediatrics, Orebro University ( for interaction 0.016). The association was driven by exposure to antibiotics Hospital, Orebro,¨ Sweden primarily used for acute otitis media and respiratory tract infections. Further, we 7Pediatric Allergy and Pulmonology Unit, Astrid found an association of antibiotic prescriptions in pregnancy (22.5%) with type 1 Lindgren Children’s Hospital, Karolinska Univer- diabetes (adjusted HR 1.15 [95% CI 1.00–1.32]). In general, sibling analysis supported sity Hospital, Stockholm, Sweden these results, albeit often with statistically nonsignificant associations. Corresponding author: Tove Fall, tove.fall@ medsci.uu.se CONCLUSIONS Received 12 June 2019 and accepted 4 February 2020 Dispensed prescription of antibiotics, mainly for acute otitis media and respiratory tract infections, in the 1st year of life is associated with an increased risk of type 1 This article contains Supplementary Data online at https://care.diabetesjournals.org/lookup/suppl/ diabetes before age 10 years, most prominently in children delivered by cesarean doi:10.2337/dc19-1162/-/DC1. section. C.A. and T.F. report equal contribution. © 2020 by the American Diabetes Association. Type 1 diabetes is one of the most common chronic diseases in childhood. Several Readers may use this article as long as the work is proposed early-life risk factors, including antibiotic treatment, are hypothesized to properly cited, the use is educational and not for profit, and the work is not altered. More infor- influence the risk of type 1 diabetes through alterations of the gut microbiome mation is available at https://www.diabetesjournals composition and subsequent effects on the immune system development (1). .org/content/license. 992 Antibiotics and the Risk of Type 1 Diabetes Diabetes Care Volume 43, May 2020 Children with type 1 diabetes are re- The aim of this study was to assess the Exposure ported to have a lower microbial di- impact of prenatal or early childhood We retrieved information on all dispensed versity of their gut flora than control exposure to antibiotics on the risk of systemic antibiotics (ATC: J01) from the children (2), and a marked decrease in type 1 diabetes (up to age 10 years) in a Swedish Prescribed Drug Register from diversity before type 1 diabetes onset is nationwide setting using a conventional 1 July 2005 to 30 September 2013 in reported (3); however, whether the mi- observational design complemented by mothers during the pregnancy and to crobiota play an active role in the path- asiblinganalysis.Wefurtherinvestigated 30 September 2014 in children during ogenesis is unclear. Antibiotic exposure this association regarding type and their 1st year. in early life delays the microbiota mat- number of prescriptions and interactions In Sweden there is no over-the-counter uration (4). A recent report from The by mode of delivery, sex, birth year, and sale of antibiotics without a prescription Environmental Determinants of Diabetes in genetic predisposition to type 1 diabetes. from a physician. The antibiotics were the Young (TEDDY) study suggested de- classified into narrow-spectrum and broad- creased abundance of five Bifidobacterium RESEARCH DESIGN AND METHODS spectrum(18)andaccordingtothe species (including Bifidobacterium den- Study Population fourth level of ATC as described in the tium) after antibiotic treatment and that The study cohort consisted of all single- Supplementary Data. We also created children with signs of islet autoimmunity ton children born in Sweden between groups based on probable site of in- have a lower abundance of Bifidobacte- 1 July 2005 and 30 September 2013 iden- fection based on the type of antibiotics rium dentium than healthy control chil- tified from the Medical Birth Register from ATC: 1) antibiotics with recommended dren (5). However, diabetes-prone rodent (MBR) (Fig. 1). The MBR includes 96–99% use for otitis media and other respira- models have shown divergent results de- of all deliveries in Sweden (16). Linkage to tory tract infections (amoxicillin, pen- pendent on the type of antibiotics, with other registers was enabled through the icillin, cephalosporin, and macrolides) and both accelerated (6,7) and reduced (8,9) Swedish personal identity number. To 2) antibiotics with recommended use for type 1 diabetes development. avoid including events of neonatal di- urinary tract or skin and soft tissue in- Although some epidemiological stud- abetes, follow-up started at age 6 months fection (pivmecillinam, trimethoprim, ies have failed to detect an association in the analysis of prenatal exposure. As sulfonamide, ciprofloxacin, norfloxacin, between prenatal (10,11) or early anti- undiagnosed type 1 diabetes often leads nitrofurantoin, cloxacillin, flucloxacillin, biotic exposure (10) and subsequent type to infections and sometimes increased and dicloxacillin) (19). 1 diabetes, others have found an asso- use of antibiotics, which would lead to Free-text information about the rea- ciation with multiple prescriptions and reverse causation, we started follow-up son for the prescription, from the pre- broad-spectrum antibiotics during early at 15 months when studying exposure in scribing physician, was available for childhood (12,13). There is also some the 1st year of life. Thus, the analyses approximately half of all prescriptions. evidence that the association of anti- excluded children with at least one dis- For a descriptive validation of the clas- biotics with type 1 diabetes could be pensed prescription of insulin (Anatomical sification of site of infection in children, modified by mode of delivery, with larger Therapeutic Chemical [ATC] classification we drew a random sample (n 5 800) of effects sizes in those with cesarean sec- system: A10A) in the Swedish Prescribed the dispensed prescriptions and let two tion births (14). Few studies have had Drug Register or who died or emigrated independent reviewers classify the site sufficient statistical power to perform before age 6 months/15 months (Fig. of infection based on the text. Infection detailed analyses of the potential influ- 1). Additional information about the site was classified as one of the following ence of antibiotics on type 1 diabetes. So registers is available in Supplementary categories: ear, lower respiratory tract, far, only two overlapping Danish studies Table 1. upper respiratory tract, unspecified re- have reported .1,000 events, and the Outcome spiratory tract, urinary tract, skin, and majority (71.8%) of the children in these We identified type 1 diabetes events in gastrointestinal tract. All disagreements studies were exposed to antibiotics dur- data from the Swedish Prescribed Drug were resolved by consensus. ing the first 2 years of life. Furthermore, Register, validated for this purpose (17), We set the start date of pregnancy as many observational studies suffer from and the National Patient Register (NPR). the date of birth of the child minus esti- unmeasured confounding. This can partly We obtained diagnoses, registered ac- mated gestational age at birth. Prenatal be remedied through sibling analyses, cording to the ICD-10, from 1 July 2005 until exposure was evaluated as any maternal which inherently account for unmea- 31 December 2013 from the NPR. The dispensed prescription during the preg- sured confounding by factors shared Swedish Prescribed Drug Register data nancy as a whole and by trimester (1– by full siblings such as paternal and were available from 1 July 2005 through 91 days, 92–189 days, and $190 days, maternal characteristics, genetic factors, 31 December 2014. Children were de- respectively) (20). This analysis was re- and family