Gerardo U Lopez

Interests

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Courses

Scholarly Contributions

Journals/Publications

• Rodriguez, A., & Lopez, G. U. (2023). Cross Reality (XR) Activities. FastTrack.
• Wagoner, R. S., Benally, K. A., Cabrera, D., Lopez, G. U., Lopez-Galvez, N. I., & Diaz, D. (2022). Prevalence of E. coli 0157:H7, Salmonella, and Cryptosporidium Among Arizona Dairy Workers Using Post-Work Swabbing. Journal of Agriculture Safety and Health.
• Rodriguez, A., DeVeau, S. N., Johnson, K. R., Ruiz, N. E., Vasovski, S., & Lopez, G. U. (2022). The AR Floating Farm Project Facilitator Guide.. FastTrack.
• Rodriguez, A., DeVeau, S. N., Johnson, K. R., Ruiz, N. E., Vasovski, S., & Lopez, G. U. (2022). The AR Floating Farm Project Student Guide.. FastTrack.
• Rodriguez, A., Webb, G., & Lopez, G. U. (2021). Virtual Agriculture. Clover by 4-H.
• Betancourt, W. Q., Lopez, G. U., Gerba, C. P., Pepper, I. L., Quintanar, D. R., & Morrison, C. (2020). Potential indicators of virus transport and removal during soil aquifer treatment of treated wastewater effluent. Water Research. doi:10.1016/j.watres.2020.115812
• Lamori, J. G., Xue, J., Taruna, A., Lopez, G. U., Kitajima, M., Gerba, C. P., Pepper, I. L., & Sherchan, S. (2019). Removal of fecal indicator bacteria and antibiotic resistant genes in constructed wetlands. Environmental Science and Pollution Research.
• Lopez, G. U., Gerba, C. P., Abd-Elmaksoud, S., Wissler, A., Sifuentes, L. Y., & Mitchell, J. (2019). Modelling of ultraviolet light inactivation kinetics of methicillin-resistantStaphylococcus aureus, vancomycin-resistantEnterococcus,Clostridium difficilespores and murine norovirus on fomite surfaces. Journal of Applied Microbiology, 126(1), 58-67. doi:10.1111/jam.14103
• Mitchell, J., Sifuentes, L., Wissler, A., Abd-Elmaksoud, S., Lopez, G. U., & Gerba, C. P. (2018). Modeling of ultraviolet light inactivation kinetics of methicillin-resistant Staphylococcus aureus, vancomycin-resistant Enterococcus, Clostridium difficile spores and murine norovirus on fomite surfaces. Journal of Applied Microbiology. doi:10.1111/jam.14103
• Wagoner, R., Lopez, G. U., Diaz, D., Cabrera, D., & Benally, K. (2018). A Pilot Project Assessing Exposure of Livestock Workers in the Southwest U.S. to E.Coli O157:H7 and Salmonella. ISEE Conference Abstracts, 2018(1). doi:10.1289/isesisee.2018.p01.3060
• Gerba, C. P., Sifuentes, L. Y., Lopez, G. U., Abd-Elmaksoud, S., Calabrese, J., & Tanner, B. (2016). Wide-spectrum activity of a silver-impregnated fabric. American journal of infection control, 44(6), 689-90. doi:http://dx.doi.org/10.1016/j.ajic.2015.11.033.
  More info

  Fabrics, such as clothing, drapes, pillowcases, and bedsheets are potential sources of pathogenic bacteria and viruses. We found fabrics (ie, professional clothing, pillowcases, and lab coats) treated with a silver-impregnated material to be effective in significantly reducing a wide spectrum of ordinary and drug-resistant microorganisms, including Salmonella, methicillin-resistant Staphylococcus aureus, Propionibacterium acnes, Trichphyton mentagrophytes, and norovirus. Fabrics impregnated with antimicrobial agents help provide an additional barrier to the transport or reservoir of pathogens in health care environments.
• Lopez, G. U., Gerba, C. P., & Ikner, L. A. (2016). Distribution of Bacteria in Dental Offices and the Impact of Hydrogen Peroxide Disinfecting Wipes. The Journal of Dental Hygiene, 90(6), 354-361.
• Gerba, C. P., Wuollet, A. L., Raisanen, P. K., & Lopez, G. U. (2015). Bacterial Contamination of Computer Touch Screens. American Journal of Infection Control, 44(3), 358-360. doi:10.1016/j.ajic.2015.10.013
  More info

  The goal of this study was to determine the occurrence of opportunistic bacterial pathogens on the surfaces of computer touch screens used in hospitals and grocery stores. Opportunistic pathogenic bacteriawere isolated on touch screens in hospitals; Clostridium difficile and vancomycin-resistant Enterococcus and in grocery stores; methicillin-resistant Staphylococcus aureus. Enteric bacteria were more common on grocery store touch screens than on hospital computer touch screens.
• Lopez, G. U., Kitajima, M., Sherchan, S. P., Sexton, J. D., Sifuentes, L. Y., Gerba, C. P., & Reynolds, K. A. (2015). Impact of disinfectant wipes on the risk of Campylobacter jejuni infection during raw chicken preparation in domestic kitchens. Journal of applied microbiology, 119(1), 245-52. doi:10.1111/jam.12834
  More info

  In the present study, we conducted a quantitative microbial risk assessment forecasting the exposure to Campylobacter jejuni contaminated surfaces during preparation of chicken fillets and how using a disinfectant-wipe intervention to clean a contaminated work area decreases the risk of infection following the preparation of raw chicken fillet in a domestic kitchen.
• Lopez, G. U., Kitajima, M., Havas, A., Gerba, C. P., & Reynolds, K. A. (2014). Evaluation of a Disinfectant Wipe Intervention on Fomite-to-Finger Microbial Transfer. Applied and Environmental Microbiology, 80(10), 3113-3118.
• Lopez, G. U., Gerba, C. P., Tamimi, A. H., Kitajima, M., Maxwell, S. L., & Rose, J. B. (2013). Transfer Efficiency of Bacteria and Viruses from Porous and Nonporous Fomites to Fingers under Different Relative Humidity Conditions. Applied and Environmental Microbiology, 79(18), 5728-5734.

Presentations

• Johnson, J., Astra, A., & Lopez, G. U. (2023, 2023-03-08). Designing a Virtual Farming System
  
  . Ignite 4-H Summit, National 4-H Council. Washington DC: National 4-H Council.
• Lopez, G. U. (2023, Spring). Update on Environmental Detection of Cyclospora cayetanensis. U.S. Food and Drug Administration (FDA) Cyclospora Task Force. Virtual, Online: FDA.
• Turner, E., Concalves, A., Thomas, H., Becerril, I., & Lopez, G. U. (2023, 2023-03-08). Drone Curriculum
  
  . Tech Changemakers (TCM) Training, National 4-h Council. Rock Eagle 4-H Center, Georgia: National 4-H Council.
• Gerba, C., Rock, C., Betancourt, W., Mondragon, P., & Lopez, G. U. (2022, Fall). Irrigation Water Safety and Quality Panel Discussion
  . 2022 Food Safety Conference, UArizona Food Safety Consortium. Invited Virtual Moderator.
• Lopez, G. U., Robertson, L., Dominguez, M., Teplitski, M., & McEntire, J. (2022, Spring). Discussion on Cyclospora on Industry Attention and Outbreaks. Cyclospora Panel
  . International Fresh Produce Association, Virtual Town Hall. Virtual Online: International Fresh Produce Association.
• Lopez, G. U. (2021, Spring). How Do You Decide On An Area of Speciality For Graduate School?. 2021 Wester Alliance to Expand Student Opportunities, Arizona State University. Virtual, Online: Arizona State University.
• Lopez, G. U. (2021, Summer). Cyclospora: Potential Reservoirs and Occurrence in Irrigation Waters. 2021 CPS Research Symposium. Virtual, Online: Center for Produce Safety.
• Lopez, G. U. (2019, Fall). Cyclospora cayetanensis. Oregon Food Safety Workshop. Clackamas, OR: BiosafeSystems.
• Lopez, G. U. (2019, Fall). Water- & Food-borne Parasites Crypto, Giardia & Cyclsopora. Yuma Food Safety Council Monthly Meeting. Yuma, AZ: Yuma Food Safety Council.
• Lopez, G. U. (2019, Spring). Cyclospora Outbreaks and Importance of Working with Stakeholders. UA Food Safety Consortium Seminar Series. UA ACBS Tucson, Arizona.
• Lopez, G. U. (2019, Summer). Cyclospora Prevalence in Irrigation Water in Fresh Produce Growing Regions. 2019 CPS Research Symposium. Austin, TX: Center For Produce Safety.
• Lopez, G. U. (2019, Summer). Cyclospora: Potential Reservoirs and Occurrence in Irrigation Waters. 2019 CPS Research Symposium. Austin, TX: Center for Produce Safety.
• Lopez, G. U. (2018, June). Cyclospora: Potential Reservoirs and Occurrence in Irrigation Waters. 2018 CPS Research Symposium. Charlotte North Carolina: Center for Produce Safety.
• Lopez, G. U. (2018, Summer). Transmissin De Cyclospora En Ambientes Agrícolas. Expo Simposium Baja Food Safety. Ensenada, Baja California, MX.
• Hauser, M. W., Christman, K. A., Gouker, S., Lopez, G. U., Moore, J. D., Horn, K., & Yarnes, A. (2017, February). 21st Century Community Learning Centers - Northern Arizona. 21st CCLC Site Coordinators Workshop. Flagstaff, AZ: Arizona Department of Education.
  More info

  Presentation by 4-H Agents and staff from Northern Arizona counties to 21st Century Learning Centers to provide resources and programming to possible sites.
• Lopez, G. U. (2017, June). Cyclospora: Potential Reservoirs and Occurrence in Irrigation Waters. 2017 CPS Research Symposium. Denver Colorado: Center for Produce Safety.
• Lopez, G. U. (2016, February). Collaborating with County 4-H STEM programs in Arizona. Annual Cooperative Extension 4-H and Family and Consumer Science In-service. Maricopa County Extension Office 4341 E. Broadway Rd. Phoenix AZ 85040: Cooperative Extension.
• Lopez, G. U. (2016, November). 4-H STEM Discovery Camp. Arizona Health Sciences Center’s Working Group of student affairs and services staffers representing the four colleges at Medicine, Pharmacy, Nursing and Public Health.. The University of Arizona, College of Pharmacy Drachman Hall A326: College of Pharmacy.

Poster Presentations

• Carstens, R., Hatch, J., Bishop, T., DeAnda, T., Flores, D., Yee, K., Geel, E., Werkhoven, C., Turner, E., Ruiz, N. E., Chavez, L. A., Gideon, A., Wilkening, E., Astra, A., & Lopez, G. U. (2023, 2023-8-02). Underwater Robotics Project 2023
  
  . 2023 Annual Cooperative Extension Conference.
• Carstens, R., Hatch, J., Bishop, T., Turner, E., Geel, E., Werkhoven, C., Martinez, D., Fonseca, J. D., Astra, A., & Lopez, G. U. (2023, 2023-8-02). Greenhouse Sustainable Energy Engineering Design (SEED) Project 2023
  
  . 2023 Annual Cooperative Extension Conference.
• Cirerol, C., Oberge, V., Rodriguez, D., Suarez, M., Truong, K., Cooper, K., & Lopez, G. U. (2023, 2023-08-02). Determine the prevalence and transmission of Cyclospora cayetanensis in the South-East Coast Region of the United States
  
  . 2023 Annual Cooperative Extension Conference:.
• Cirerol, C., Perez, A., Rodriguez, D., Nguyen, M., Acosta-Perez, M., Kartoz, J., Suarez, M., Truong, K., Arvisu, E., & Lopez, G. U. (2023, 2023-03-30). Determine the Prevalence and Transmission of Cyclospora cayetanensis in South-East Coast Region of the United States
  
  . 2023 Agriculture, Life & Veterinary Sciences & Cooperative Extension (ALVSCE) Research Poster Forum.
• DeVeau, S., Martinez, D., Geel, E., Werkhoven, C., Ruiz, N. E., Johnson, K., Jeffers-Menges, A., Turner, E., Turner, S., Hunter, K., Hallman, R., Cirerol, C., Notah, A., Rodriguez, D., Astra, A., Elliot-Engel, J., Broaddus, B., Haselby, R., Mulls, C. D., , Jacobs, K., et al. (2023, 2023-03-30). Space Mission Command 2022: 4-H Multi-State Space Exploration Consortium (4-HMSSEC)
  
  . 2023 Agriculture, Life & Veterinary Sciences & Cooperative Extension (ALVSCE) Research Poster Forum.
• Hlomatchi, J., Cirerol, C., Rodriguez, D., Truong, K., Acosta-Perez, M., Kartoz, J., Suarez, M., Arvisu, E., Perez, A., German, X., Fullen, L., Rollins, M., Gregory, A., Wu, H., & Lopez, G. U. (2023, 2023-03-30). Analyzing the Prevalence and Transmission of Cyclospora cayetanensis in the West Coast Produce Growing Regions of the United States
  . 2023 Agriculture, Life & Veterinary Sciences & Cooperative Extension (ALVSCE) Research Poster Forum.
• Kartoz, J., Cirerol, C., Rodriguez, D., Acost-Perez, M., Suarez, M., Truong, K., Arvisu, E., Moreno, L., & Lopez, G. U. (2023, 2023-03-30). Prevalence Studies in the Western United States for Epidemiological Investigation of Cyclosporiasis Outbreaks
  
  . 2023 Agriculture, Life & Veterinary Sciences & Cooperative Extension (ALVSCE) Research Poster Forum.
• Martinez, H., Truong, K., Rodriguez, D., Cirerol, C., Suarez, M., German, X., Perez, A., Wilcox, C., Gregory, A., Yazzie, L. C., Leon, S., Cruz, J., Arredondo, C., & Lopez, G. U. (2023, 2023-10-25). Comparison of Two Gene Targets for the Prevalence of Cyclospora cayetanensis in Irrigation Waters from US Westcoast Fresh Produce Growing Regions
  
  . 2023 Food Safety Conference, UArizona Food Safety ConsortiumLab Volunteer Spring 2022.
• Perez, A., Truong, K., Rodriguez, D., Cirerol, C., Suarez, M., German, X., Wilcox, C., & Lopez, G. U. (2023, 2023-10-25). Comparison of Two Gene Targets for the Prevalence of Cyclospora cayetanensis in Irrigation Waters from US Southeast Fresh Produce Growing Regions
  
  . 2023 Food Safety Conference, UArizona Food Safety ConsortiumLab Volunteer Spring 2022.
• Ruiz, N. E., Becerril, I., Astra, A., & Lopez, G. U. (2023, 2023-8-02). : 4-H Tech Changemakers 2023
  
  . 2023 Annual Cooperative Extension Conference.
• Ruiz, N. E., Johnson, K., Jeffers-Menges, A., Turner, E., Turner, S., Carstens, R., Geel, E., Werkhoven, C., Chavez, L. A., Astra, A., Cirerol, C., Notah, A., Elliot-Engel, J., & Lopez, G. U. (2023, 2023-03-30). Arizona 4-H Tech Changemakers 2022: Teen TCM Reducing the Digital Divide in our Underserved and Rural Communities
  
  . 2023 Agriculture, Life & Veterinary Sciences & Cooperative Extension (ALVSCE) Research Poster Forum.
• Suarez, M., Cirerol, C., Rodriguez, D., Truong, K., Kartoz, J., Arvisu, E., & Lopez, G. U. (2023, 2023-03-30). Analyzing the Prevalence and Transmission of Cyclospora cayetanensis in the Southwestern United States and Mexico
  
  . 2023 Agriculture, Life & Veterinary Sciences & Cooperative Extension (ALVSCE) Research Poster Forum.
• Truong, K., Cirerol, C., Rodriguez, D., Kartoz, J., Suarez, M., Perez, A., German, X., Fullen, L., Hlomatchi, J., Rollins, M., Gregory, A., Wu, H., & Lopez, G. U. (2023, 2023-03-30). Understanding the Prevalence and Transmission of Cyclospora cayetanensis in Florida Regions
  
  . 2023 Agriculture, Life & Veterinary Sciences & Cooperative Extension (ALVSCE) Research Poster Forum.
• Truong, K., Rodriguez, D., Cirerol, C., Suarez, M., German, X., Perez, A., Wilcox, C., Oberge, V., Cooper, K., & Lopez, G. U. (2023, 2023-10-25). Development of a Genotyping Workflow for Cyclospora cayetanensis in Irrigation Waters Using Oxford Nanopore MinION Sequencing. 2023 Food Safety Conference, UArizona Food Safety ConsortiumLab Volunteer Spring 2022.
• Turner, E., Ruiz, N. E., Lonchar, T., Astra, A., & Lopez, G. U. (2023, 2023-8-02). Lego Robotics Project 2023
  
  . 2023 Annual Cooperative Extension Conference.
• Cirerol, C., Rodriguez, D., Nguyen, M., Acost-Perez, M., Kartoz, J., Suarez, M., Truong, K., Arvisu, E., & Lopez, G. U. (2022, Fall). Determine the Prevalence and Transmission of Cyclospora cayetanensis in South-East Coast Region of the United States
  
  . 2022 Food Safety Conference, UArizona Food Safety Consortium.
• Kartoz, J., Cirerol, C., Rodriguez, D., Acost-Perez, M., Suarez, M., Truong, K., Arvisu, E., Moreno, L., & Lopez, G. U. (2022, Fall). Prevalence Studies in the Western United States for Epidemiological Investigation of Cyclosporiasis Outbreaks
  
  . 2022 Food Safety Conference, UArizona Food Safety Consortium.
• Suarez, M., Cirerol, C., Rodriguez, D., Truong, K., Acost-Perez, M., Kartoz, J., Arvisu, E., & Lopez, G. U. (2022, Fall). Analyzing the Prevalence and Transmission of Cyclospora cayetanensis in the Southwestern United States and Mexico
  
  . 2022 Food Safety Conference, UArizona Food Safety Consortium.
• Lopez, G. U., Lonchar, T., Johnson, K. R., Ruiz, N. E., DeVeau, S. N., Sekaquaptewa, S. K., Kaye, Y., Parra, A. P., Lester, D. F., Morris, N. A., Elliott-Engel, J., & Geel, E. (2020, September). 4-H STEM YOUniversity: Robotics 101 Virtual Camp Fall 2020. 4-H STEM YOUniversity Program. Tucson, AZ.
• Lopez, G. U., Lonchar, T., Yee, K., Hanson, H., Rivas, E. L., Ruiz, N. E., DeVeau, S. N., Vasovski, S., Johnson, K. R., Sekaquaptewa, S. K., Kaye, Y., Josytewa, S., Arias, J. M., Muwanas-Arias, N., Kinlicheenie, K. L., Contreras, S., Munoz, E., Smith, D., Parra, A. P., , Lester, D. F., et al. (2020, August). 4-H STEM YOUniversity: Robotics CoderZ Virtual Camp Fall 2020. Annual University of Arizona Cooperative Extension Conference. Tucson, AZ.
• Rodriguez, A., Lopez, G. U., DeVeau, S. N., Vasovski, S., Johnson, K. R., Ruiz, N. E., Parra, A. P., Lester, D. F., Morris, N. A., & Elliott-Engel, J. (2020, August). 4-H STEM YOUniversity: AR Floating Farm Virtual Camp Fall 2020. Annual University of Arizona Cooperative Extension Conference. Tucson, AZ.
• Lopez, G. U., Christman, K. A., Cooper, M. A., Carstens, R., Thoutt, E., Gonzalez, M., Vasovski, S., Cabrera, D. D., Lonchar, T., Geel, E., Torres, M. A., Lopez, J., Perez, S., & Villa Barbosa, G. (2019, Summer). The University of Arizona Cooperative Extension 4-H Program Collaborating Statewide in Preparing the Next Generation of STEM Innovators. Arizona Cooperative Extension Conference "Pillar of the Community". Tucson, AZ: UA Cooperative Extension.
• Morris, N. A., Elliott-Engel, J., Lopez, G. U., Moore, J. D., Christman, K. A., Avery, D., & Walsh, M. E. (2019, August). Arizona 4-H Summit: Campus, Career, and Community Engagement. Annual Conference. Tucson, AZ: Arizona Cooperative Extension.
• Morris, N. A., Elliott-Engel, J., Lopez, G. U., Moore, J. D., Christman, K. A., Avery, D., & Walsh, M. E. (2019, August). Arizona 4-H Summit: Campus, career, and community engagement. Annual University of Arizona Cooperative Extension Conference. Tucson, AZ.
• Morris, N. A., Morris, N. A., Elliott-Engel, J., Elliott-Engel, J., Lopez, G. U., Lopez, G. U., Moore, J. D., Moore, J. D., Christman, K. A., Christman, K. A., Avery, D., Avery, D., Walsh, M. E., & Walsh, M. E. (2019, August). Arizona 4-H Summit: Campus, Career, and Community Engagement [EC1]. Annual University of Arizona Cooperative Extension Conference. Tucson, AZ.
• Walsh, M. E., Morris, N. A., Avery, D., Elliott-Engel, J., Christman, K. A., Lopez, G. U., Moore, J. D., Moore, J. D., Lopez, G. U., Christman, K. A., Avery, D., Elliott-Engel, J., Morris, N. A., & Walsh, M. E. (2019, August). Arizona 4-H Summit: Campus, Career, and Community Engagement. Annual University of Arizona Cooperative Extension Conference. Tucson, AZ.

Other Teaching Materials

• Ortega, Y., DaSilva, A., Durigan, M., Murphy, H., Qvarnstrom, Y., Arrowood, M. J., Kahler, A., Mandrell, R., Brennan, J., Gurrisi, J., Osterholm, M., Cabrera, D., Torres, M., & Lopez, G. U. (2019. Cyclospora cayetanensis Fact Sheet. Blue Ribbon Panel.