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Infectious Dermatitis in Companion Animals: A One Health Perspective
Lola Cellier1, Helena Guimarães1, Ana Cardoso1
1University Institute of Health Sciences, Cooperativa de Ensino Superior Politécnico e Universitário (IUCS-CESPU), Avenida Central de Gandra 1317, 4585-116 Paredes, Portugal.
Animals : an Open Access Journal From MDPI
|August 13, 2026
Summary
Antibiotic-resistant Staphylococcus pseudintermedius is common in companion animal dermatitis in Northern Portugal. This highlights the need for antimicrobial susceptibility testing and ongoing resistance surveillance in veterinary dermatology.
Area of Science:
- Veterinary Dermatology
- Antimicrobial Resistance
- Companion Animal Health
Background:
- Infectious dermatitis in companion animals is often linked to staphylococci.
- Rising antimicrobial resistance in these bacteria poses a significant threat to veterinary and public health.
Purpose of the Study:
- To investigate Staphylococcus species, dermatophytes, and ectoparasites in companion animals with dermatitis in Northern Portugal.
- To characterize the antimicrobial resistance of isolated staphylococci.
Main Methods:
- MALDI-TOF MS for Staphylococcus identification.
- Phenotypic antimicrobial susceptibility testing.
- PCR for resistance genes.
- Analysis of 71 dermatological samples from dogs and cats.
Main Results:
- Staphylococcus isolates were found in 29 cases, predominantly S. pseudintermedius (66%).
- 65% of isolates showed resistance to at least one antimicrobial; 7% were multidrug-resistant.
- High resistance rates for penicillin (62%), tetracycline (24%), and oxacillin (21%).
- Prevalent resistance genes included tetM, blaZ, and mecC.
- No dermatophytes detected; two ectoparasite cases (Demodex, Otodectes).
Conclusions:
- Antibiotic-resistant S. pseudintermedius is prevalent in companion animal dermatitis.
- Emphasizes the critical need for timely antimicrobial susceptibility testing.
- Underscores the importance of continuous antimicrobial resistance surveillance in veterinary dermatology.
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