Kelman P, Thompson CW, Hynes W, Bergman C, Lenahan C, Brenner JS, Brenner MG, Goodman B, Borges D, Filak M, Gaff H. (2018) Rickettsia parkeri infections diagnosed by eschar biopsy, Virginia, USA. Infection. To appear.

Nadolny, R. M., & Gaff, H. D. (2018) Natural history of Ixodes affinis in Virginia. Ticks and Tick-borne Diseases. 9(1):109-119.

Nadolny, R. M., & Gaff, H. D. (2018) Natural history of Amblyomma maculatum in Virginia. Ticks and Tick-borne Diseases. To appear.

Maliyoni M, Chirove F, Gaff HD, Govinder KS. (2017) A Stochastic Tick-Borne Disease Model: Exploring the Probability of Pathogen Persistence. Bulletin of Mathematical Biology. 79(9):1999-2021.

Shannon AB, Rucinsky R, Gaff HD, Brinkerhoff RJ. (2017) Borrelia miyamotoi, Other Vector-Borne Agents in Cat Blood and Ticks in Eastern Maryland. EcoHealth. 6:1-5.

Butler, J., Butler, M. J., Gaff, H. (2017) Snap, crackle, and pop: acoustic-based model estimation of snapping shrimp populations in healthy and degraded hard-bottom habitats. Ecological Indicators. To appear.

Manore, C.A., Ostfeld, R.S., Agusto, F.B., Gaff, H., LaDeau, S.L. (2017) Defining the Risk of Zika and Chikungunya Virus Transmission in Human Population Centers of the Eastern United States. PLoS Negl Trop Dis 11(1): e0005255. doi:10.1371/journal.pntd.0005255

Nadolny RM, Gauthier DT, Gaff HD, Bermudez SE. Preliminary assessment of the population genetics of Ixodes affinis (Ixodida: Ixodidae) in North and Central America. Systematic and Applied Acarology. 2016 Aug 24;21(10):1300-8.

Springer, Yuri P., et al. (2016) Tick‐, mosquito‐, and rodent‐borne parasite sampling designs for the National Ecological Observatory Network. Ecosphere 7.5.

Campana, M.G., Hawkins, M.T., Henson, L.H., Stewardson, K., Young, H.S., Card, L.R., Lock, J., Agwanda, B., Brinkerhoff, J., Gaff, H.D., Helgen, K.M. Maldonado, J.E., McShea, W.J., Fleischer, R. C. Simultaneous identification of host, ectoparasite and pathogen DNA via in-solution capture. Molecular ecology resources. 2016.

Fister, K. R., Gaff, H., Lenhart, S., Numfor, E., Schaefer, E., & Wang, J. (2016). Optimal control of vaccination in an age-structured cholera model. In Mathematical and Statistical Modeling for Emerging and Re-emerging Infectious Diseases (pp. 221-248). Springer International Publishing.

Walter KS, Pepin KM, Webb CT, Gaff HD, Krause PJ, Pitzer VE, Diuk-Wasser MA. Invasion of two tick-borne diseases across New England: harnessing human surveillance data to capture underlying ecological invasion processes. Proc. R. Soc. B 2016 283 20160834; DOI: 10.1098/rspb.2016.0834.

Heller, E. L., Wright, C. L., Nadolny, R. M., Hynes, W. L., Gaff, H., and Walters, E. L. (2015). New Records of Ixodes affinis (Acari: Ixodidae) Parasitizing Avian Hosts in Southeastern Virginia.. Journal of medical entomology

Nadolny, R., Gaff, H., Carlsson, J., and Gauthier, D. (2015). Comparative population genetics of two invading ticks: Evidence of the ecological mechanisms underlying tick range expansions.. Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases, 35, (pp. 153-62).

Wright, C. L., Sonenshine, D., Gaff, H., and Hynes, W. L. (2015). Rickettsia parkeri Transmission to Amblyomma americanum by Cofeeding with Amblyomma maculatum (Acari: Ixodidae) and Potential for Spillover.. Journal of medical entomology, 52 (5), (pp. 1090-5).

Wright, C. L., Gaff, H., Sonenshine, D., and Hynes, W. L. (2015). Experimental vertical transmission of Rickettsia parkeri in the Gulf Coast tick, Amblyomma maculatum.. Ticks and tick-borne diseases, 6 (5), (pp. 568-73).

Parham, P. E., Waldock, J., Christophides, G. K., Hemming, D., Agusto, F., Evans, K. J., Fefferman, N., Gaff, H., Gumel, A., LaDeau, S., Lenhart, S., Mickens, R. E., Naumova, E. N., Ostfeld, R. S., Ready, P. D., Thomas, M. B., Velasco-Hernandez, J., and Michael, E. (2015). Climate, environmental and socio-economic change: weighing up the balance in vector-borne disease transmission.. Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 370 (1665),

Florin, D., Brinkerhoff, R. J., Gaff, H., Jiang, J., Robbins, R. G., Eickmeyer, W., Butler, J., Nielsen, D., Wright, C., White, A., Gimpel, M., and Richards, A. (2014). Additional U.S. collections of the Gulf Coast tick, Amblyomma maculatum (Acari: Ixodidae), from the State of Delaware, the first reported field collections of adult specimens from the State of Maryland, and data regarding this tick from surveillance of migratory songbirds in Maryland. Systematic & Applied Acarology, 19 (3), (pp. 257-262).

Wright, C., Hynes, W. L., White, B., Marshall, M., Gaff, H., and Gauthier, D. (2014). Single-tube real-time PCR assay for differentiation of Ixodes affinis and Ixodes scapularis. Ticks and Tick-borne Diseases, 5, (pp. 48?52).

Nadolny, R., Wright, C., Sonenshine, D., Hynes, W. L., and Gaff, H. (2014). Ticks and spotted fever group rickettsiae of southeastern Virginia. Ticks and Tick-borne Diseases, 5, (pp. 53?57).

Brown, J., Kelman, P., and Gaff, H. (2014). Using Pheromones to Enhance Field Tick Collection Techniques. Letters in Biomathematics, 1 (1),

Zheng, H., Gaff, H., Smith, G., and DeLisle, S. (2014). Whole-system replication to optimize aberration-detection methods for biosurveillance. PLoS ONe, 9 (7), (pp. e100845).

Gaff, H., White, A., Leas, K., Kelman, P., Squire, J. C., Livingston, D. L., Sullivan, G. A., Baker, E. W., and Sonenshine, D. (2014). TickBot: A novel robotic device for controlling tick populations in the natural environment.. Ticks and tick-borne diseases

Wright, C. L., Gaff, H., and Hynes, W. L. (2014). Prevalence of Ehrlichia chaffeensis and Ehrlichia ewingii in Amblyomma americanum and Dermacentor variabilis collected from southeastern Virginia, 2010-2011.. Ticks and tick-borne diseases, 5 (6), (pp. 978-82).

Stich, R. W., Blagburn, B. L., Bowman, D. D., Carpenter, C., Cortinas, M. R., Ewing, S. A., Foley, D., Foley, J. E., Gaff, H., Hickling, G. J., Lash, R. R., Little, S. E., Lund, C., Lund, R., Mather, T. N., Needham, G. R., Nicholson, W. L., Sharp, J., Varela-Stokes, A., and Wang, D. (2014). Quantitative factors proposed to influence the prevalence of canine tick-borne disease agents in the United States.. Parasites & vectors, 7, (pp. 417).

Chitanga, S., Gaff, H., and Mukaratirwa, S. (2014). Tick-borne pathogens of potential zoonotic importance in the southern African Region.. Journal of the South African Veterinary Association, 85 (1), (pp. 1084).

Tracy, J. K., Schluterman, N. H., Greene, C., Sow, S. O., and Gaff, H. (2014). Planning for human papillomavirus (HPV) vaccination in sub-Saharan Africa: a modeling-based approach.. Vaccine, 32 (26), (pp. 3316-22).

Gaines, D. N., Operario, D. J., Stroup, S., Stromdahl, E., Wright, C., Gaff, H., Broyhill, J., Smith, J., Norris, D. E., Henning, T., Lucas, A., and Houpt, E. (2014). Ehrlichia and spotted fever group Rickettsiae surveillance in Amblyomma americanum in Virginia through use of a novel six-plex real-time PCR assay.. Vector borne and zoonotic diseases (Larchmont, N.Y.), 14 (5), (pp. 307-16).

Zheng, H., Gaff, H., Smith, G. M., and DeLisle, S. (2014). Epidemic surveillance using an electronic medical record: an empiric approach to performance improvement.. PloS one, 9 (7), (pp. e100845).

Alonzo, J., Gaff, H., and Watson, G. S. (2013). A Laboratory for Collaboration: Rehearsal Communication Skills for Biologists and Mathematicians. Biology International, 53,

Gaff, H., and Nadolny, R. (2013). Identifying requirements for the invasion of a tick species and tick-borne pathogen through TICKSIM. Mathematical Biosciences and Engineering, 10, (pp. 625?635).

Adongo, D., Fister, K., Gaff, H., and Hartley, D. (2013). Optimal control applied to Rift Valley fever. Natural Resource Modeling, 26, (pp. 385?402).

Niu, T., Hartley, D., Papelis, Y., and Gaff, H. (2012). An epidemiological model of Rift Valley fever with spatial dynamics. Computational and Mathematical Methods in Medicine, 2012, (pp. 1?12).

Hartley, D., Barker, C., A Le Menach, Niu, T., Gaff, H., and Reisen, W. (2012). The effects of temperature on the emergence and seasonality of West Nile virus in California. American Journal of Tropical Medicine & Hygiene, 86, (pp. 884?894).

Fedrow, A., Wright, C., Gaff, H., Sonenshine, D., Hynes, W. L., and Richards, A. (2012). In vitro propagation of Candidatus Rickettsia andeanae isolated from Amblyomma maculatum. FEMS Immunology and Medical Microbiology, 64 (74-81),

Alexanderian, A., Gobbert, M., Fister, K., Gaff, H., Lenhart, S., and Schaefer, E. (2011). An age-structured model for the spread of epidemic cholera: analysis and simulation. Nonlinear Analysis: Real World Applications, 12, (pp. 3483?3498).

Gaff, H., Lyons, M. M., and Watson, G. S. (2011). Classroom manipulative to engage students in mathematical modeling of disease spread: 1+1 = achoo!. Mathematical Modeling of Natural Phenomena, 6 (6), (pp. 215-226).

Tracy, L., Gaff, H., Burgess, C., Sow, S., Gravitt, P., and Tracy, J. (2011). Estimating the impact of human papillomavirus (HPV) vaccination on HPV prevalence and cervical cancer incidence in Mali. Clinical Infectious Diseases, 52, (pp. 641?645).

Mukandavire, Z., Liao, S., Wang, J., Gaff, H., Smith, D., and Morris, J. G. (2011). Estimating the reproductive numbers for the 2008-2009 cholera outbreaks in Zimbabwe. Proceedings of the National Academies, 108 (21), (pp. 8767-8772).

Nadolny, R. M., Wright, C. L., Hynes, W. L., Sonenshine, D., and Gaff, H. (2011). Ixodes affinis (Acari: Ixodidae) in southeastern Virginia and implications for the spread of Borrelia burgdorferi, the agent of Lyme disease. Journal of Vector Ecology, 36 (2), (pp. 464 – 467).

Gaff, H., Burgess, C., Jackson, J., Niu, T., Papelis, Y., and Hartley, D. (2011). Mathematical model to assess the relative effectiveness of Rift Valley fever countermeasures. International Journal of Artificial Life Research, 2 (2), (pp. 1-18).

Hartley, D. M., Rinderknecht, J. L., Nipp, T. L., Clarke, N. P., Snowder, G. D., and Advisory Group, F. R. (2011). Potential effects of Rift Valley fever in the United States. Emerging Infectious Diseases, 17 (8),

Gaff, H. (2011). Preliminary analysis of an agent-based model for a tick-borne disease. Mathematical Biosciences and Engineering, 8 (2), (pp. 465?475).

Wright, C., Nadolny, R., Jiang, J., Richards, A., Sonenshine, D., Gaff, H., and Hynes, W. L. (2011). Tidewater Spotted Fever: Detection of Rickettsia parkeri in Gulf Coast ticks, southeastern Virginia. Emerging Infectious Diseases, 17 (5), (pp. 896-898).

Gaff, H., Schaefer, E., and Lenhart, S. (2011). Use of optimal control models to predict treatment time for managing tick-borne disease. Journal of Biological Dynamics, 5, (pp. 517?530).

Jungck, J. R., Gaff, H., Fagen, A., and Lobov, J. B. (2010). From the National Academies “Beyond BIO2010: Celebration and Opportunities” at the Intersection of Biology. CBE–Life Sciences Education, 9 (3), (pp. 143-147).

Jungck, J. R., Gaff, H., and Weisstein, A. (2010). Mathematical Manipulative Models: In Defense of ?Beanbag Biology?. CBE?Life Sciences Education, 9, (pp. 201?211).

Neilan, R. M., Schaefer, E., Gaff, H., Fister, K. R., and Lenhart, S. (2010). Modeling optimal intervention strategies for cholera. Bulletin of Mathematical Biology, 72 (8), (pp. 2004-2018).

Lyons, M. M., Ward, J. E., Gaff, H., Hicks, R., Drake, J., and Dobbs, F. (2010). Theory of island biogeography on a microscopic scale: organic aggregates as islands for aquatic pathogens. Aquatic Microbial Ecology, 60 (1),

Gaff, H., and Schaefer, E. (2009). Optimal control applied to vaccination and treatment strategies for various epidemiological models. Mathematical Biosciences and Engineering, 6, (pp. 469-492).

Duke-Sylvester, S. M., Perencevich, E. N., Furuno, J. P., Real, L. A., and Gaff, H. (2008). Advancing epidemiological science through computational modeling: a review with novel examples. Annales Zoologici Fennici, 45, (pp. 385-401).

Gaff, H., Gross, L., and Schaefer, E. (2008). Results from a mathematical model for human monocytic ehrlichiosis. Clinical Microbiology and Infection, 15 (s2), (pp. 15-16).

Gaff, H., Hartley, D., and Leahy, N. (2007). An epidemiological modelfor Rift Valley fever virus. Electronic Journal of Differential Equations, 2007 115, (pp. 1-12).

Gaff, H., and Gross, L. J. (2007). Analysis of a tick-borne disease model with varying populaton sizes in various habitats. Bulletin of Mathematical Biology, 69, (pp. 265-288).

Joshi, H. R., Lenhart, S., Lou, H., and Gaff, H. (2007). Harvesting control in an integrodifference population model with concave growth term. Nonlinear Analysis: Hybrid Systems, 1, (pp. 417-429).

Gaff, H., and Gross, L. (2007). Modeling tick-borne disease: a metapopulation analysis. Bulletin of Mathematical Biology, 69, (pp. 265?288).

Gaff, H., Joshi, H. R., and Lenhart, S. (2007). Optimal harvesting during an invasion of a sublethal plan pathogen. Environmental and Development Economics, 12, (pp. 673-686).

Furuno, J. P., Harris, A. D., Wright, M. O., Hartley, D. M., McGregor, J. C., Gaff, H., Hebden, J. N., Standiford, H. C., and Perencevich, E. N. (2007). Utility of active surveillance culturing for methicillin-resistant Staphylococcus aureus upon intensive care unit discharge.. Infection Control and Hospital Epidemiology, 28, (pp. 666-670).

Joshi, H. R., Lenhardt, S., and Gaff, H. (2006). Optimal harvesting in an integro-difference population model. Optimal Control Applications and Methods, 26, (pp. 61-75).

Gaff, H., Chick, J., DeAngelis, D., Gross, L., Trexler, J., and Salinas, R. (2004). Evaluation of and insights from ALFISH: a spatially-explicit, landscape-level simulation of fish populations in the Everglades. Hydrobiologia, 520, (pp. 73?86).

Gaff, H., DeAngelis, Gross, L., Salinas, R., and Shorrosh, M. (2000). A dynamic landscape model for fish in the Everglades and its application to restoration. Ecological Modelling, 127, (pp. 33?52).

Book Chapters

Gauthier, D., Latour, R. J., Gaff, H., and Vogelbein, W. K. Mycobacteriosis in Chesapeake Bay Striped Bass (Morone saxatilis).Northeast Atlantic Coast Striped Bass Fisheries Management

Gaff, H., Kocan, K. M., and Sonenshine, D. (2014). Tick-borne Rickettsioses II (Anaplasmataceae).Biology of Ticks Volume 2, Second Edition. USA: Oxford University Press.

Gammack, D., Schaefer, E., and Gaff, H. (2013). Global dynamics emerging from local interactions: agent-based modeling for the life sciences.Mathematical concepts and methods in modern biology : using modern discrete models. Amsterdam: Academic Press.

Gaff, H., and Schaefer, E. (2008). Metapopulation models in tick-borne disease transmission modelling.Modelling parasitic Disease Transmission: Biology to Control. Austin, TX, USA: Landes Bioscience / Eurekah.

Gaff, H., and Schaefer, E. (2008). Modeling parasitic Disease Transmission: Biology to Control.. Austin, TX: Biosceince / Eureukah.

Conference Proceeding

White A and Gaff H. Ticky Business Simulation. Proceedings of the 2016 Student Capstone Conference. Suffolk, VA: Virginia Modeling, Analysis and Simulation Center (VMASC).

White A, Wright C, Schaefer E, Gaff H. Dynamics of two pathogens in a single tick population. Proceedings of the 2015 Student Capstone Conference. Suffolk, VA: Virginia Modeling, Analysis and Simulation Center (VMASC).

White A, Nadolny R and Gaff H, Modeling Effectiveness of Tick Control by a Species that Exhibits Predator-prey Role Reversal. Proceedings of the 2014 Student Capstone Conference. Suffolk, VA: Virginia Modeling, Analysis and Simulation Center (VMASC).

Drake Tillinghast, D., and Gaff, H. (2012). An agent-based model of the dynamics of a tick-borne disease.. Suffolk, Virginia: Proceedings of the 2012 Student Capstone Conference.

Eggleston, J., Gaff, H., and Watson, G. S. (2012). Mathematics in a biological context: the use of modeling, analysis and simulation to enhance STEM education.. Suffolk, Virginia: Proceedings of the 2012 Student Capstone Conference.

Wigglesworth-Ballard, L., Wiles, L., and Gaff, H. (2012). Simulation of infectious disease spread in a clinical lab setting: a pilot study.. Suffolk, Virginia: Proceedings of the 2012 Student Capstone Conference.

Goodman, K., Gaff, H., and De Leo, G. (2012). The application of interactive behavior change technologies to enhance patient education among adults diagnosed with diabetes.. Suffolk, Virginia: Proceedings of the 2012 Student Capstone Conference.

Scott, G., and Gaff, H. (2011). Preliminary modeling solutions for prevention of Medicare insolvency for the Baby Boomer generation.. Suffolk, Virginia: Proceedings of the 2011 Student Capstone Conference.

Alzahrani, M., Gaff, H., Shuman, D., and , R. (2011). Using modeling and simulation to improve oral health services delivery in Norfolk Public Health District Dental Clinic, Little Creek.. Suffolk, Virginia: Proceedings of the 2011 Student Capstone Conference.

Goodman, K., and Gaff, H. (2010). An analysis of biosurveillance and potential threats to public health.. Suffolk, Virginia: Proceedings of the 2010 Student Capstone Conference.

Jackson, J., and Gaff, H. (2010). The use of Getis and Ord cluster analysis for analyzing rainfall data in relation to Rift Valley fever outbreaks.. Suffolk, Virginia: Proceedings of the 2010 Student Capstone Conference.

Wigglesworth-Ballard, L., and Gaff, H. (2010). Use of polyethylene microspheres to simulate hospital acquired infections: a teaching strategy for healthcare students and workers.. Suffolk, Virginia: Proceedings of the 2010 Student Capstone Conference.

Alzahrani, M., and Gaff, H. (2010). Using modeling and simulation to improve oral health services delivery.. Suffolk, Virginia: Proceedings of the 2010 Student Capstone Conference.