| Somatic cell count thresholds in composite and quarter milk samples as indicator of bovine intramammary infection status J Karzis, EF Donkin, EC Webb, EMC Etter, IM Petzer Onderstepoort Journal of Veterinary Research 84 (1), 1-10, 2017 | 82 | 2017 |
| Trends in udder health and emerging mastitogenic pathogens in South African dairy herds IM Petzer, J Karzis, JC Watermeyer, TJ Van der Schans, R Van Reenen Journal of the South African Veterinary Association 80 (1), 17-22, 2009 | 60 | 2009 |
| Sensitivity and specificity of a hand-held milk electrical conductivity meter compared to the California mastitis test for mastitis in dairy cattle GT Fosgate, IM Petzer, J Karzis The Veterinary Journal 196 (1), 98-102, 2013 | 52 | 2013 |
| Validity of somatic cell count as indicator of pathogen-specific intramammary infections J Karzis, EF Donkin, IM Petzer, EC Webb, EMC Etter Journal of the South African Veterinary Association 88 (1), 1-10, 2017 | 43 | 2017 |
| Value of tests for evaluating udder health in dairy goats: somatic cell counts, California Milk Cell Test and electrical conductivity IM Petzer, EF Donkin, E Du Preez, J Karzis, TJ Van der Schans, ... Onderstepoort Journal of Veterinary Research 75 (4), 279-287, 2008 | 24 | 2008 |
| The influence of intramammary antibiotic treatment, presence of bacteria, stage of lactation and parity in dairy goats as measured by the California Milk Cell Test and somatic … J Karzis, EF Donkin, IM Petzer Onderstepoort Journal of Veterinary Research 74 (2), 161-167, 2007 | 19 | 2007 |
| Proactive udder health management in South Africa and monitoring of antibiotic resistance of Staphylococcus aureus in dairy herds from 2001 to 2010 J Karzis, IM Petzer, EF Donkin, V Naidoo Journal of the South African Veterinary Association 89 (1), 1-8, 2018 | 14 | 2018 |
| Intramammary antibiotics in dairy goats: effect of stage of lactation, parity and milk volume on withdrawal periods, and the effect of treatment on milk compositional quality J Karzis, EF Donkin, IM Petzer Onderstepoort Journal of Veterinary Research 74 (3), 243-249, 2007 | 13 | 2007 |
| Climatic and regional antibiotic resistance patterns of Staphylococcus aureus in South African dairy herds EMC Etter, V Naidoo, EF Donkin, IM Petzer, J Karzis Onderstepoort Journal of Veterinary Research 86 (1), 1-9, 2019 | 12 | 2019 |
| A cost-benefit model comparing the California milk cell test and milk electrical resistance test IM Petzer, J Karzis, IA Meyer, TJ Van der Schans Onderstepoort Journal of Veterinary Research 80 (1), 1-6, 2013 | 10 | 2013 |
| Host adapted intramammary infections in pregnant heifers which were co-housed and reared on fresh milk as calves IM Petzer, J Karzis, M Lesosky, JC Watermeyer, R Badenhorst BMC veterinary research 9, 1-6, 2013 | 9 | 2013 |
| Intramammary antibiotics in dairy goats: Withdrawal periods and tissue tolerance J Karzis PQDT-Global, 2005 | 9 | 2005 |
| A pathogen-specific approach towards udder health management in dairy herds: Using culture and somatic cell counts from routine herd investigations IM Petzer, J Karzis, EF Donkin, EC Webb Onderstepoort Journal of Veterinary Research 83 (1), 1-12, 2016 | 8 | 2016 |
| Intramammary antibiotics in dairy goats: withdrawal periods of three intramammary antibiotics compared to recommended withdrawal periods for cows J Karzis, EF Donkin, IM Petzer Onderstepoort Journal of Veterinary Research 74 (3), 217-222, 2007 | 8 | 2007 |
| Effects of milking machine settings and teat liners on bovine udder health P Vermaak, IM Petzer, J Karzis South African Journal of Animal Science 52 (4), 421-432, 2022 | 6 | 2022 |
| The spread and antimicrobial resistance of Staphylococcus aureus in South African dairy herds–A review J Karzis, IM Petzer, V Naidoo, EF Donkin The Onderstepoort Journal of Veterinary Research 88 (1), 2021 | 6 | 2021 |
| Epidemiological and partial budget analysis for treatment of subclinical Staphylococcus aureus intramammary infections considering microbiological and cytological scenarios IM Petzer, EMC Etter, EF Donkin, EC Webb, J Karzis Preventive Veterinary Medicine 148, 66-77, 2017 | 6 | 2017 |
| Comparing effects of freezing at-196° C and-20° C on the viability of mastitis pathogens IM Petzer, J Karzis, TJ Van der Schans, JC Watermeyer, S Eloff, ... Onderstepoort Journal of Veterinary Research 79 (1), 1-6, 2012 | 6 | 2012 |
| Withdrawal periods and tissue tolerance after intramammary antibiotic treatment of dairy goats with clinical mastitis J Karzis, EF Donkin, IM Petzer Onderstepoort Journal of Veterinary Research 74 (4), 281-288, 2007 | 6 | 2007 |
| Surveillance of Antibiotic Resistance of Maltose-Negative Staphylococcus aureus in South African Dairy Herds J Karzis, IM Petzer, EF Donkin, V Naidoo, EMC Etter Antibiotics 9 (9), 616, 2020 | 5 | 2020 |
