Epidemiology of tetanus in Canada, 1995-2019.

OBJECTIVES: This report aims to use tetanus hospitalization data to describe the epidemiology in Canada from 1995 to 2019 and to assess progress on national reduction targets, including validating that Canada has eliminated maternal and neonatal tetanus (MNT). METHODS: Tetanus hospitalizations and fatalities occurring between 1995 and 2019 were retrieved from the Canadian Institute for Health Information (CIHI) and Statistics Canada. Cases coded with ICD-10 codes A33, A34, or A35 as the primary diagnosis (or ICD-9 equivalents) were included. The Canadian national case definition was used for generic tetanus and definitions from the World Health Organization were referenced for MNT. R version 4.0.2 was used for analyses. RESULTS: From 1995 to 2019, 155 non-MNT, 6 neonatal, and 0 maternal tetanus cases were retrieved from CIHI. However, all 6 neonatal cases were excluded after validating with provincial/territorial public health officials. In the same time period, there were 91 national notifications of tetanus. Cases were distributed relatively equally across the country, with the exception of the territories, where zero cases were reported. Adults 75 and over had significantly higher incidence rates compared to younger age groups (p<0.001). Ten deaths were reported during the timeframe. CONCLUSION: Tetanus incidence remains low and hospitalization data reveal that Canada has met its reduction target of maintaining 5 cases or fewer annually in recent years. For MNT, Canada has successfully met the elimination target of zero cases. Continued vaccination efforts must be practiced for all age groups, including those aged 75 years and older, to sustain targets moving forward.

RéSUMé: OBJECTIFS: Ce rapport vise à utiliser les données sur les hospitalisations dues au tétanos pour décrire l'épidémiologie au Canada de 1995 à 2019 et pour évaluer les progrès réalisés par rapport aux objectifs nationaux de réduction, notamment pour confirmer que le Canada a éliminé le tétanos maternel et néonatal (TMN). MéTHODES: Les données sur les hospitalisations et les décès attribuables au tétanos survenus entre 1995 et 2019 proviennent de l'Institut canadien d'information sur la santé (ICIS) et de Statistique Canada. Les cas pour lesquels les codes sont CIM-10 A33, A34 ou A35 comme diagnostic primaire (ou leurs équivalents CIM-9) sont inclus. La définition de cas nationale canadienne a été utilisée pour le tétanos générique et les définitions de l'Organisation mondiale de la santé ont servi de référence pour le TMN. La version 4.0.2 de R a été utilisée pour les analyses. RéSULTATS: De 1995 à 2019, il y a eu 155 cas de tétanos autres que TMN, 6 cas de tétanos néonatal et 0 cas de tétanos maternel selon l'ICIS. Cependant, les 6 cas de tétanos néonatal ont été exclus après validation auprès des responsables de la santé publique provinciaux/territoriaux. Durant la même période, il y a eu 91 notifications nationales de cas de tétanos. Ces cas étaient répartis de manière relativement égale à travers du pays, à l'exception des territoires, où aucun cas n'a été signalé. Les adultes de 75 ans et plus présentaient des taux d'incidence significativement plus élevés que les groupes d'âge plus jeune (p<0,001). Dix décès ont été rapportés pendant cette période. CONCLUSION: L'incidence du tétanos reste faible et les données sur les hospitalisations révèlent que le Canada a atteint son objectif de réduction de 5 cas ou moins par an au cours des dernières années. En ce qui concerne le TMN, le Canada a réussi à atteindre l'objectif d'élimination des cas. Il faut poursuivre les efforts de vaccination pour tous les groupes, y compris les personnes âgées de 75 ans et plus, afin de maintenir les objectifs à l'avenir.

Novel Polyomaviruses in Mammals from Multiple Orders and Reassessment of Polyomavirus Evolution and Taxonomy.

As the phylogenetic organization of mammalian polyomaviruses is complex and currently incompletely resolved, we aimed at a deeper insight into their evolution by identifying polyomaviruses in host orders and families that have either rarely or not been studied. Sixteen unknown and two known polyomaviruses were identified in animals that belong to 5 orders, 16 genera, and 16 species. From 11 novel polyomaviruses, full genomes could be determined. Splice sites were predicted for large and small T antigen (LTAg, STAg) coding sequences (CDS) and examined experimentally in transfected cell culture. In addition, splice sites of seven published polyomaviruses were analyzed. Based on these data, LTAg and STAg annotations were corrected for 10/86 and 74/86 published polyomaviruses, respectively. For 25 polyomaviruses, a spliced middle T CDS was observed or predicted. Splice sites that likely indicate expression of additional, alternative T antigens, were experimentally detected for six polyomaviruses. In contrast to all other mammalian polyomaviruses, three closely related cetartiodactyl polyomaviruses display two introns within their LTAg CDS. In addition, the VP2 of Glis glis (edible dormouse) polyomavirus 1 was observed to be encoded by a spliced transcript, a unique experimental finding within the Polyomaviridae family. Co-phylogenetic analyses based on LTAg CDS revealed a measurable signal of codivergence when considering all mammalian polyomaviruses, most likely driven by relatively recent codivergence events. Lineage duplication was the only other process whose influence on polyomavirus evolution was unambiguous. Finally, our analyses suggest that an update of the taxonomy of the family is required, including the creation of novel genera of mammalian and non-mammalian polyomaviruses.

Genome Sequences of Murine Pneumotropic Virus (Polyomaviridae) Detected in Wild House Mice (Mus musculus).

Using generic PCR, we identified a variant of murine pneumotropic virus (MptV) (family Polyomaviridae) in 3 wild house mice (Mus musculus). The fully amplified and sequenced genomes display considerable differences from the MptV genomes published previously and enlighten us on the natural diversity of rodent polyomaviruses.

Genome Sequences of Polyomaviruses from the Wild-Living Red Colobus (Piliocolobus badius) and Western Chimpanzee (Pan troglodytes verus).

We identified with PCR and sequencing the full genomes of the recently discovered Pan troglodytes verus polyomavirus 8 and Piliocolobus badius polyomavirus 2 in a western chimpanzee and a western red colobus free-ranging in Taï National Park of Côte d'Ivoire.

Genome Sequence of Bovine Polyomavirus 1 Detected in a Salers Cow (Bos taurus) from Catalonia, Spain.

We identified a variant of the first bovine polyomavirus (BPyV1; family Polyomaviridae) in a lymph node of a Salers cow. As the 2 previously published genome sequences of this virus originated from fetal bovine serum and ground beef, respectively, this is the first BPyV1 genome that could be traced back to an individual.