Biological and Biomedical Sciences Graduate Program

Cow lying down  


Cornell Combined DVM/PhD Degree Program

Patrick Ayscue, Current Combined DVM/PhD Student

Patrick AyscuePatrick Ayscue
Field of Comparative Biomedical Sciences
Faculty Mentor: Yrjo Grohn

Current Position: Epidemic Intelligence Service Officer at the Center for Disease Control (CDC) and Prevention


Brief Biography

Patrick began his work at Cornell in the Fall of 2006. He was born and raised in Florida and attended college at Emory University in Atlanta. After graduating, he worked with the Wildlife Conservation Society in Cambodia as a Luce Scholar planning livestock health interventions and implementing programs to test wild birds for highly pathogenic avian influenza. His current research is an extension of his interest in the epidemiology of emerging and zoonotic diseases. He is working with Dr. Yrjo Grohn to examine the relative roles of animal-animal transmission and environmental habitats in the propagation of E. coli O157:H7 in cattle feedlots, the putative reservoir of human infection. Patrick is currently developing mathematical models capable of teasing apart the dynamics of a bacterial pathogen with complex ecological interactions outside of the host organism


BS, Biology/Environmental Studies- Emory University

Research Interests

I am currently working on elucidating the epidemiology of E. coli O157:H7. Specifically, I am examining the contribution of environmental and animal habitats to the propagation of the bacteria in cattle feedlots, the putative reservoir for human infection. I am developing novel mathematical models to address these questions and test intervention strategies at the population level.


Lanzas C, Ayscue P, Ivanek R, and Gröhn YT. Model or Meal? Animal agriculture systems as models for infectious diseases of humans. Nature Reviews Microbiology. 2010 Feb; 8(2): 139-148.

Ayscue P, Lanzas C, Ivanek R, and Gröhn YT. Modeling On-farm dynamics of Escherichia coli O157:H7 propagation.Foodborne Pathog Dis. 2009 May; 6 (4):461-470.

Ayscue P, Lanzas C, Ivanek R, and Gröhn YT (in prep). A model appropriate for the study of free-living pathogens.

Ayscue P, Lanzas C, Ivanek R, and Gröhn YT (2008). Examining On-Farm Dynamics of Escherichia coli O157:H7 Propagation: A Move to Pathogen-based Models. Epidemics Conference.

Lanzas C, Warnick LD, Ivanek R, Ayscue P, Nydam DV, and Gröhn YT (2008). The risk and control of Salmonella outbreaks in calf-raising operations: a mathematical modeling approach. Veterinary Research 39 (6):61.

Lanzas C, Brien S, Lo Chapagain P, Ray KA, Ayscue P, Warnick LD, and Gröhn YT (2008). The effect of heterogenous infectious period and contagiousness on the dynamics of Salmonella transmission in dairy cattle. Epidemiology and Infection 16:1-15.