S. Michelle Todd

ORCID: 0000-0001-7799-9500
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About
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Research Areas
  • Vector-borne infectious diseases
  • Insect and Pesticide Research
  • Vector-Borne Animal Diseases
  • Animal Virus Infections Studies
  • SARS-CoV-2 and COVID-19 Research
  • Invertebrate Immune Response Mechanisms
  • Virus-based gene therapy research
  • Microbial infections and disease research
  • Animal Disease Management and Epidemiology
  • Antimicrobial Peptides and Activities
  • Oral microbiology and periodontitis research
  • Insect and Arachnid Ecology and Behavior
  • Bacteriophages and microbial interactions
  • Viral Infections and Immunology Research
  • Streptococcal Infections and Treatments
  • Otolaryngology and Infectious Diseases
  • Insect Resistance and Genetics
  • Infections and bacterial resistance
  • Entomopathogenic Microorganisms in Pest Control
  • Gut microbiota and health
  • Clostridium difficile and Clostridium perfringens research
  • Amoebic Infections and Treatments
  • Influenza Virus Research Studies
  • Bacillus and Francisella bacterial research
  • Bacterial Identification and Susceptibility Testing

Virginia–Maryland College of Veterinary Medicine
2011-2024

Virginia Tech
2012-2024

University of Georgia
2019

Fondazione Edmund Mach
2013

Old Dominion University
2005-2008

Theileria orientalis Ikeda genotype is a parasite that causes disease in cattle results major economic issues Asia, New Zealand, and Australia. The transmitted by Haemaphysalis longicornis ticks, which have recently been reported numerous states throughout the eastern United States. Concurrently, Virginia showed clinical signs consistent with hemoprotozoan infection. We used amplicons specific for piroplasm surface protein small subunit rDNA of piroplasms to test blood samples from PCR....

10.3201/eid2509.190088 article EN cc-by Emerging infectious diseases 2019-06-25

Theileria orientalis is a tick-borne hemoparasite that causes anemia, ill thrift, and death in cattle globally. The Ikeda strain of T. more virulent than other strains, leading to severe clinical signs up 5% affected animals. Within the Asia-Pacific region, where it affects 25% Australian cattle, has significant economic impact on industry. In 2017, was detected herd Albermarle County, Virginia, United States. Months earlier, U.S. alerted invasion Asian longhorned tick, Haemaphysalis...

10.1186/s13071-021-04659-9 article EN cc-by Parasites & Vectors 2021-03-16

Melanoma in humans and dogs is considered highly immunogenic; however, the function of tumor-infiltrating lymphocytes (TILs) often suppressed tumor microenvironment. In humans, current immunotherapies target checkpoint molecules (such as PD-L1, expressed by cells), inhibiting their suppressive effect over TILs. The role PD-L2, an alternative PD-1 ligand also overexpressed malignant tumors patients with anti-PD-L1 resistance, remains poorly understood. study, we evaluated expression molecule...

10.1177/03009858211011939 article EN Veterinary Pathology 2021-06-25

Abstract. The black‐legged tick Ixodes scapularis Linnaeus (Acari: Ixodidae) is an important vector of microbial pathogens. Knowledge the tick's innate immune response, particularly defensin and other antimicrobial peptides, for understanding how microbes survive in this tick. A gene ( sln A) from I. was obtained by reverse transcription–polymerase chain reaction (RT–PCR) using mRNA extracted tissues female ticks. RT–PCR indicated expressed midgut, haemocytes, fat‐body, although no evidence...

10.1111/j.1365-2915.2005.00579.x article EN Medical and Veterinary Entomology 2005-12-01

Fusobacterium spp. are Gram-negative, oral bacteria that increasingly associated with human pathologies as diverse periodontitis, preterm birth, and colorectal cancer. While a recent surge in F. nucleatum research has increased our understanding of this pathogen, lack complete genomes hindered the identification characterization host-pathogen virulence factors. Here we report first eight sequenced using an Oxford Nanopore MinION Illumina sequencing pipeline assembled open-source program...

10.1128/msphere.00269-18 article EN cc-by mSphere 2018-07-04

RNA viruses rapidly mutate, which can result in increased virulence, escape from vaccine protection, and false-negative detection results. Targeted methods have a limited ability to detect unknown often provide insufficient data coinfections or identify antigenic variants. Random, deep sequencing is method that more fully characterize coupled with molecular techniques culture for viral enrichment. We tested third-generation the viruses. Cultures of bovine diarrhea virus, canine distemper...

10.1177/1040638720981019 article EN Journal of Veterinary Diagnostic Investigation 2020-12-24

Introduction Theileria orientalis Ikeda genotype is an emerging cattle disease in the US. Since 2017, when T. was discovered beef two counties Virginia, infections have risen to include ~67% of Virginia and 14 states. Consistent with New Zealand studies, many infected herds were >90% positive upon initial testing without overt evidence infection. Central bull tests present a unique opportunity study effects infections, as bulls from multiple source are consolidated. The objective this...

10.3389/fvets.2024.1432228 article EN cc-by Frontiers in Veterinary Science 2024-07-18

The transcript sequence of the Amblyomma americanum Linnaeus (Acari: Ixodidae) defensin, termed amercin (amn), was ascertained and a 219-bp amn coding region identified. gene encodes 72-amino acid prepropeptide with putative 37-amino mature peptide. This shows little similarity to either defensins from hebraeum Koch, only other species for which defensin has been described. Sequence comparisons tick reveal be shorter (6 bp or 2 amino acids) than Ixodes scapularis Dermacentor variabilis (Say)...

10.1111/j.1365-2915.2007.00682.x article EN Medical and Veterinary Entomology 2007-06-01

Theileria orientalis Ikeda is a newly identified agent of bovine infectious anemia in the United States. Although T. transmitted by ticks other than tick that transmits Anaplasma marginale-a bacterial etiology anemia-the geographic distributions these 2 organisms overlap, with coinfection reported some cattle. Only anaplasmosis has an approved effective treatment To provide rapid diagnostic information for producers anemic animals, we developed duplex real-time PCR (rtPCR) A. marginale and...

10.1177/10406387211057627 article EN Journal of Veterinary Diagnostic Investigation 2021-11-11

Theileria orientalis, genotype Ikeda, was recently detected in North America. Determining the emerging distribution of this pathogen is critical for understanding spread and developing management strategies. Whole blood samples were collected from cattle at Virginia livestock markets September 2018 through December 2020. Animals tested T. orientalis using a universal then specific real-time PCR based on MPSP gene. Prevalence each analyzed temporal trends mapped by county. Spatial patterns...

10.3390/pathogens11111353 article EN cc-by Pathogens 2022-11-15

We report the complete genome sequence of a clinical isolate Providencia stuartii strain CMC-4104, isolated from splenic abscess. Oxford Nanopore Technologies (ONT) and Illumina sequencing reads were assembled using Geneious to generate 4,504,925-bp circular chromosome containing multiple copies NDM-1 PER-1 genes in genomic resistance island.

10.1128/mra.00514-22 article EN Microbiology Resource Announcements 2022-08-04

To expand surveillance testing capacity through sample pooling, a thorough understanding is needed of how dilution pooling affects the sensitivity candidate assays. We validated robust and representative framework for assessing effect using duplex rtPCR

10.1177/10406387241287516 article EN Journal of Veterinary Diagnostic Investigation 2024-10-26

Abstract RNA viruses rapidly mutate, which can result in increased virulence, escape from vaccine protection, and false negative detection results. Targeted methods have a limited ability to detect unknown often provide insufficient data coinfections or identify antigenic variants. Random, deep sequencing is method that more fully characterize coupled with molecular techniques culture for viral enrichment. Viral third-generation were tested the viruses. Cultures of bovine diarrhea virus,...

10.1101/2019.12.16.875872 preprint EN cc-by-nd bioRxiv (Cold Spring Harbor Laboratory) 2019-12-16

Understanding the virulence mechanisms of human pathogens from genus Fusobacterium has been hindered by a lack properly assembled and annotated genomes. Here we report first complete genomes for seven strains, as well resequencing reference strain F. nucleatum subsp. ATCC 25586 (seven total species, eight genomes). A highly efficient cost-effective sequencing pipeline was achieved using sample multiplexing short-read Illumina (150 bp) long-read Oxford Nanopore MinION (>80 kbp) platforms,...

10.1101/305573 preprint EN cc-by-nc-nd bioRxiv (Cold Spring Harbor Laboratory) 2018-04-20

Abstract BACKGROUND Theileria orientalis is a tick-borne hemoparasite that causes anemia, ill thrift, and death in cattle globally. The Ikeda strain of T. more virulent than other strains, leading to severe clinical signs less 5% affected animals. Within the Asia-Pacific region, where it affects 25% Australian cattle, has significant economic impact on industry. In 2017, was detected herd Albermarle County, Virginia, United States. Months earlier, U.S. alerted invasion Asian longhorned tick,...

10.21203/rs.3.rs-90827/v1 preprint EN cc-by Research Square (Research Square) 2020-10-15

Abstract Background Infectious necrotic hepatitis (INH) is typically a disease of ruminants caused by Clostridium novyi type B. Growth the causative agent supported development an anaerobic environment within liver. In dogs, C. rare and has only been previously reported as post-mortem diagnosis. one case, infection was secondary to metastatic pancreatic adenocarcinoma other presumptively diagnosed on histopathology hepatic lesion in dog initially presented for acute collapse. Case...

10.1186/s12917-022-03436-9 article EN cc-by BMC Veterinary Research 2022-10-05

Abstract Theileria orientalis ikeda is a newly identified agent of bovine infectious anemia in the United States. Although it transmitted by separate tick hosts than Anaplasma marginale – bacterial etiology –the geographic distributions these two organisms overlap, with co-infection reported some cattle. Only anaplasmosis has approved effective treatment To provide rapid diagnostic information for producers anemic animals, we developed duplex qPCR A. and T. . With cut-off 38 cycles, assay...

10.1101/2021.04.28.441839 preprint EN cc-by-nc-nd bioRxiv (Cold Spring Harbor Laboratory) 2021-04-28

Effects of Bifidobacteriumlongum bv. Infantis CCUG 52486 combined with glucooligosaccharide on immune cell populations in healthy young and older subjects receiving an influenza vaccination - Volume 72 Issue OCE1

10.1017/s0029665113000451 article EN Proceedings of The Nutrition Society 2013-01-01
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