# [Feline Upper Respiratory Infections](/knowledge/bacteria/pet-bacteria/feline-upper-respiratory-infections-bacterial-pathogens) (Feline Herpesvirus, Calicivirus, and Bordetella): Etiology, Clinical Signs, Zoonotic Potential, and Therapeutics ## Key Takeaways - Feline upper respiratory infections (URIs) are primarily caused by felid alphaherpesvirus 1 (FHV-1), feline calicivirus (FCV), and *Bordetella bronchiseptica*, frequently co-infecting cats and complicating diagnosis. - FHV-1 establishes lifelong latency in sensory neurons, with reactivation triggered by stress, while FCV exhibits significant genetic diversity and manipulates host cell metabolism for replication. - Transmission occurs via direct contact and aerosolized secretions, with multi-cat environments and young/immunocompromised individuals being high-risk factors for infection. - Clinical signs range from ocular/nasal discharge and oral ulcers (FHV-1, FCV) to tracheobronchitis and pneumonia (*B. bronchiseptica*), with virulent systemic FCV causing severe morbidity and mortality. - Diagnostic confirmation relies on PCR panels, with FHV-1 and FCV being the most frequently detected pathogens; *B. bronchiseptica* is zoonotic and can cause pertussis-like illness in immunocompromised humans. - Therapeutic strategies include antiviral agents for FHV-1 (e.g., famciclovir), antimicrobial therapy for *B. bronchiseptica* (e.g., doxycycline), and supportive care for all URI cases, alongside vaccination as a cornerstone of prevention. --- ## Introduction [Feline upper respiratory infections](/knowledge/bacteria/pet-bacteria/feline-upper-respiratory-infections-causes-transmission-and-treatment) (URIs) represent a complex of viral and bacterial diseases that are among the most common infectious conditions encountered in domestic cats worldwide [1, 2]. The primary etiological agents include felid alphaherpesvirus 1 (FeAHV-1, commonly termed feline herpesvirus type 1 or FHV-1), [feline calicivirus](/knowledge/viruses/pet-viruses/feline-calicivirus) (FCV), and the bacterium *[Bordetella bronchiseptica](/knowledge/bacteria/pet-bacteria/bordetella-bronchiseptica)* [3, 4]. These pathogens frequently co-infect feline patients, complicating clinical diagnosis and therapeutic management [3, 5]. Understanding the biophysical mechanisms of host cell interaction, the molecular epidemiology of circulating strains, and the zoonotic implications of these agents is essential for veterinary practitioners and diagnostic specialists. ## Etiology and Biophysical Mechanisms ### Feline Herpesvirus Type 1 (FHV-1) FHV-1 is an enveloped, double-stranded DNA virus belonging to the genus *Varicellovirus* within the family *Herpesviridae* [6]. The viral particle is approximately 150-200 nm in diameter and possesses a lipid envelope derived from the host cell nuclear membrane [6]. FHV-1 exhibits a predilection for epithelial cells of the upper respiratory tract, conjunctiva, and cornea [1, 7]. Following primary infection, the virus establishes lifelong latency in sensory neurons of the trigeminal ganglia, with periodic reactivation triggered by stress, immunosuppression, or corticosteroid administration [6]. Transcriptomic analyses of Crandell-Rees feline kidney (CRFK) cells infected with FHV-1 field and vaccine strains have revealed differential expression of genes involved in innate immune signaling, apoptosis, and cellular stress responses [6]. ### [Feline Calicivirus](/knowledge/viruses/pet-viruses/feline-calicivirus) (FCV) FCV is a non-enveloped, single-stranded positive-sense RNA virus belonging to the family *Caliciviridae* [8, 9]. The viral capsid is composed of the major structural protein VP1, which forms 90 dimers arranged in a T=3 icosahedral lattice [9, 10]. The leader of the capsid protein (LC) is post-translationally modified by palmitoylation and forms oligomers stabilized by disulfide bonds, a process essential for efficient viral replication [9]. FCV exhibits significant genetic diversity, with multiple genogroups and strains circulating globally [2, 11]. A novel genogroup has been identified through molecular evolution studies in group-housed cats in China [11]. The virus manipulates central carbon metabolism in infected cells, upregulating glycolysis and glutaminolysis to support viral replication [12]. Reverse genetics systems have been constructed for FCV strains such as FCV-BJ616, enabling proteomic analysis of host-virus interactions [8]. ### [Bordetella bronchiseptica](/knowledge/bacteria/pet-bacteria/bordetella-bronchiseptica) *Bordetella bronchiseptica* is a Gram-negative, aerobic, motile coccobacillus that colonizes the ciliated respiratory epithelium of cats [13, 14]. The bacterium expresses multiple virulence factors, including filamentous hemagglutinin, pertactin, and a type III secretion system, which facilitate adherence to host cells and evasion of mucociliary clearance [13]. *B. bronchiseptica* is closely related to *Bordetella pertussis* and *Bordetella parapertussis*, the causative agents of whooping cough in humans, and shares several virulence determinants [13]. ## Epidemiology and Transmission ### How Do Cats Get Respiratory Infections? Transmission of FHV-1, FCV, and *B. bronchiseptica* occurs primarily through direct contact with infected cats via aerosolized respiratory secretions, fomites, and contaminated environments [2, 3]. FHV-1 is shed in ocular, nasal, and oral secretions during acute infection and during periods of reactivation [1]. FCV is shed in oral and nasal secretions and can persist in the environment for weeks due to its non-enveloped structure [15, 16]. *B. bronchiseptica* is transmitted through aerosol droplets and direct contact, with carrier cats serving as reservoirs [13]. Risk factors for infection include multi-cat environments such as shelters, catteries, and boarding facilities [2, 3]. Young kittens, geriatric cats, and immunocompromised individuals are at increased risk of severe disease [7, 17]. Co-infections with multiple respiratory pathogens are common, with studies reporting high rates of concurrent FHV-1 and FCV detection in clinical samples [3, 5]. The epidemiology of these pathogens was influenced by changes in cat population dynamics during the COVID-19 pandemic, with alterations in shelter intake and adoption rates affecting transmission patterns [3]. ### Are [Cat Respiratory Infections](/knowledge/bacteria/pet-bacteria/cat-respiratory-infections-etiology-clinical-signs-zoonotic-potential-management) Dangerous? Feline URIs can range from mild, self-limiting disease to severe, life-threatening illness [1, 17]. Virulent systemic FCV (VS-FCV) infections are associated with high morbidity and mortality, characterized by severe pneumonia, footpad edema, ulcerative skin lesions, and multi-organ failure [17]. Chronic sequelae of FHV-1 infection include corneal sequestra, symblepharon, and chronic rhinosinusitis [7, 13]. Computed tomographic evidence has demonstrated concurrent middle ear, upper airway, and lower airway disease in cats with chronic respiratory signs, supporting the concept of united airway disease [18]. Secondary bacterial infections, including those caused by *Mycoplasma* species and *B. bronchiseptica*, can exacerbate clinical signs and complicate treatment [14, 19]. ## Clinical Signs and Pathology ### FHV-1 Clinical Signs Acute FHV-1 infection typically presents with serous to mucopurulent ocular discharge, conjunctivitis, chemosis, sneezing, and nasal discharge [1, 7]. Ophthalmic manifestations are particularly prominent in kittens and may include corneal ulceration, keratitis, and eosinophilic keratitis [7]. Chronic FHV-1 infection is associated with stromal keratitis, corneal sequestra, and nasolacrimal duct obstruction [7, 13]. Slaviero et al. documented the occurrence and pathology of FHV-1 and FCV in cats with respiratory disease, noting that FHV-1 was associated with necrotizing rhinitis and conjunctivitis [1]. ### FCV Clinical Signs FCV infection typically causes acute oral ulceration, salivation, pyrexia, and mild upper respiratory signs [15, 16]. Oral ulcers are most commonly observed on the tongue, hard palate, and lips [20]. Some FCV strains cause a chronic lymphoplasmacytic stomatitis, which is difficult to manage therapeutically [20]. VS-FCV infection presents with severe systemic signs including pyrexia, facial and limb edema, ulcerative skin lesions, icterus, and fatal pneumonia [17]. Postoperative outbreaks of FCV infection have been reported following routine ovariohysterectomy, suggesting that surgical stress may trigger viral shedding and transmission in veterinary hospital settings [20]. ### Bordetella bronchiseptica Clinical Signs *B. bronchiseptica* infection in cats typically causes a mild to moderate tracheobronchitis characterized by coughing, sneezing, and nasal discharge [13]. In kittens and immunocompromised cats, infection can progress to bronchopneumonia [13]. Chronic bronchitis and bronchiolitis with prominent globule leukocyte infiltration has been described in a cat co-infected with *Filobacterium felis* and *B. bronchiseptica* [14]. ### Pathology Gross pathological findings in FHV-1 infection include conjunctival hyperemia, corneal edema, and turbinate necrosis [1]. Histologically, FHV-1 causes intranuclear eosinophilic inclusion bodies in epithelial cells, with associated necrosis and neutrophilic inflammation [1]. FCV infection is characterized by epithelial necrosis and vesicle formation in the oral mucosa, with lymphoplasmacytic infiltration [1, 17]. In VS-FCV cases, pulmonary lesions include severe interstitial pneumonia with alveolar edema and hyaline membrane formation [17]. *B. bronchiseptica* infection results in suppurative bronchopneumonia with peribronchial lymphoid hyperplasia [13, 14]. ## Zoonotic Potential ### [Is Cat Respiratory Infection Contagious to Humans](/knowledge/bacteria/pet-bacteria/feline-upper-respiratory-infection-zoonotic-potential)? The zoonotic potential of FHV-1 and FCV is considered negligible. FHV-1 is highly species-specific and does not replicate in human cells [1]. FCV is similarly restricted to felids, with no documented cases of human infection [9, 10]. However, *B. bronchiseptica* is a zoonotic pathogen capable of causing respiratory disease in immunocompromised humans, particularly those with underlying pulmonary conditions or immunosuppression [13]. Human infection with *B. bronchiseptica* typically presents as a pertussis-like illness with paroxysmal coughing [13]. Veterinary personnel and immunocompromised individuals should exercise appropriate infection control measures when handling cats with suspected *B. bronchiseptica* infection [13]. For a broader discussion of zoonotic considerations, see the article on [Feline Upper Respiratory Infections: Zoonotic Potential and Public Health](/knowledge/bacteria/pet-bacteria/feline-upper-respiratory-infections-zoonotic-potential-public-health). ## Diagnostics ### Sample Collection and Laboratory Testing Diagnostic confirmation of feline URI pathogens relies on molecular detection methods, virus isolation, and serological assays [4, 21]. Polymerase chain reaction (PCR) panels targeting FHV-1, FCV, and *B. bronchiseptica* are widely used in veterinary diagnostic laboratories [4, 5]. A retrospective analysis of respiratory PCR panels performed at a veterinary diagnostic center demonstrated that FHV-1 and FCV were the most frequently detected pathogens in feline samples [4]. ### Point-of-Care and Molecular Diagnostics Rapid and sensitive detection of FHV-1 has been achieved using fluorescent microspheres as labels for immunochromatographic test strips, enabling point-of-care diagnosis [22]. An automated portable [loop-mediated isothermal amplification](/knowledge/diagnostics/molecular/lamp-assay-rapid-detection-african-swine-fever-virus-oral-fluids) (LAMP) based centrifugal microfluidic system has been developed for nucleic acid detection of multiple feline URI pathogens, offering rapid, multiplexed detection in field settings [21]. For a detailed review of point-of-care molecular diagnostics, see the article on [Point-of-Care Molecular Diagnostics for Feline Upper Respiratory Pathogens: FHV-1, FCV, and Bordetella](/knowledge/diagnostics/emerging-tech/point-of-care-molecular-diagnostics-feline-upper-respiratory-fhv1-fcv-bordetella). ### Serological and Biomarker Assays Serum amyloid A and haptoglobin concentrations have been evaluated as biomarkers of inflammation in cats with respiratory diseases, with elevated levels correlating with disease severity [23]. Commercial ELISA kits are available for detection of FHV-1 and FCV antibodies, although serology is of limited utility in distinguishing acute infection from prior exposure or vaccination [23]. ### Diagnostic Prediction Models Noninvasive diagnostic prediction models have been constructed for feline nasal and nasopharyngeal diseases using clinical examination findings and imaging data [24]. Computed tomography is increasingly used to evaluate the extent of upper and lower airway disease in cats with chronic respiratory signs [18]. ### Differential Diagnosis Differential diagnoses for feline URI include other viral pathogens such as [feline gammaherpesvirus](/knowledge/viruses/pet-viruses/feline-gammaherpesvirus), which has been investigated in cats with and without upper respiratory tract disease [25]. *Mycoplasma* species, including *Mycoplasma felis*, are also important differentials and can cause respiratory disease in cats [19]. For a comprehensive overview of bacterial etiologies, see the article on [Feline Upper Respiratory Tract Infections: Bacterial Etiology, Antibiograms, and Novel Therapeutics](/knowledge/bacteria/pet-bacteria/feline-urinary-respiratory-bacterial-etiologies-antibiograms-therapeutics). ## Treatment and Therapeutics ### Antiviral Therapy Antiviral therapy for FHV-1 includes topical and systemic administration of nucleoside analogues such as famciclovir, which is metabolized to penciclovir and inhibits viral DNA polymerase [7]. Cidofovir, a nucleotide analogue, is used topically for ophthalmic FHV-1 infections [7]. No specific antiviral therapy is approved for FCV infection, although ribavirin and interferon-omega have demonstrated in vitro activity [10]. ### Antimicrobial Therapy Secondary bacterial infections, including those caused by *B. bronchiseptica*, require appropriate antimicrobial therapy [13]. Doxycycline is the antimicrobial of choice for *B. bronchiseptica* infection, with fluoroquinolones and amoxicillin-clavulanate as alternative options [13]. Antimicrobial susceptibility testing is recommended to guide therapy, particularly in cases of recurrent or refractory infection [13]. ### Supportive Care Supportive care is the mainstay of treatment for feline URI and includes nutritional support, fluid therapy, and airway humidification [7, 13]. Ophthalmic manifestations require topical lubrication, antibiotic ointments, and in severe cases, surgical intervention such as conjunctival grafting or corneal sequestrectomy [7]. ### Vaccination Vaccination against FHV-1 and FCV is a cornerstone of preventive medicine in cats [10, 15]. Modified-live and inactivated vaccines are available, with the modified-live intranasal vaccine providing more rapid onset of mucosal immunity [10]. An engineered VP1 mRNA vaccine has demonstrated induction of immunity and complete protection against FCV challenge in cats, representing a promising next-generation vaccine platform [10]. Vaccine strains of FHV-1 and FCV have been characterized at the transcriptomic level, revealing differences in host gene expression profiles compared to field strains [6, 26]. ### Novel Therapeutics Engineered VP1 [mRNA vaccines](/knowledge/viruses/general/advancements-and-clinical-dynamics-of-mrna-vaccines-a-comprehensive-review) represent a novel therapeutic approach for FCV, inducing robust humoral and cellular immune responses [10]. Characterization and immunogenic evaluation of epidemic FCV strains is ongoing to inform vaccine strain selection [15]. For a discussion of novel therapeutics in bacterial respiratory infections, see the article on [Bacterial Respiratory Infections in Cats: Etiology, Clinical Signs, and Treatment](/knowledge/bacteria/pet-bacteria/bacterial-respiratory-infections-cats-etiology-clinical-treatment). ## Control and Prevention Control of feline URI in multi-cat environments requires a comprehensive approach including vaccination, isolation of infected animals, environmental disinfection, and stress reduction [2, 3]. FHV-1 is inactivated by lipid solvents and common disinfectants, while FCV is more resistant to disinfection due to its non-enveloped structure [1]. *B. bronchiseptica* is susceptible to quaternary ammonium compounds and bleach solutions [13]. ## Diagnostic and Therapeutic Decision Tree ```mermaid flowchart TD A["Cat presenting with URI signs"] --> B{"Clinical examination"} B --> C["Ocular signs predominant?"] C -->|"Yes"| D["Suspect FHV-1"] C -->|"No"| E["Oral ulcers present?"] E -->|"Yes"| F["Suspect FCV"] E -->|"No"| G["Coughing predominant?"] G -->|"Yes"| H["Suspect Bordetella"] G -->|"No"| I["Perform PCR panel"] D --> I F --> I H --> I I --> J{"Pathogen detected?"} J -->|"FHV-1"| K["Antiviral therapy + supportive care"] J -->|"FCV"| L["Supportive care + isolation"] J -->|"Bordetella"| M["Antimicrobial therapy"] J -->|"Multiple pathogens"| N["Combination therapy"] J -->|"None detected"| O["Consider other etiologies"] K --> P["Monitor for chronic sequelae"] L --> P M --> P N --> P O --> Q["Advanced diagnostics: CT, biopsy"] ``` ## References [1] Slaviero M, de Almeida BA, de Castro LT, et al. 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Engineered VP1 mRNA Vaccine Induces Immunity and Complete Protection Against [Feline Calicivirus](/knowledge/viruses/pet-viruses/feline-calicivirus) in Cats. *Transbound Emerg Dis*. 2026. https://pubmed.ncbi.nlm.nih.gov/41658352/ [11] Zhang Y, Cheng Z, Guo C, et al. Discovery of a novel genogroup [feline calicivirus](/knowledge/viruses/pet-viruses/feline-calicivirus) through molecular evolution in group-housed cats in China. *Sci Rep*. 2025. https://pubmed.ncbi.nlm.nih.gov/40447696/ [12] Zhao G, Zhu H, Xue X, et al. [Feline Calicivirus](/knowledge/viruses/pet-viruses/feline-calicivirus) Infection Manipulates Central Carbon Metabolism. *Vet Sci*. 2025. https://pubmed.ncbi.nlm.nih.gov/40005898/ [13] Niedenführ T, Zöllner M, Schulz B. Chronic rhinitis in dogs and cats - an overview of etiology, diagnostics and therapy. *Tierarztl Prax Ausg K Kleintiere Heimtiere*. 2025. https://pubmed.ncbi.nlm.nih.gov/40233793/ [14] Shiga T, Kakinuma Y, Takada M, et al. 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Rapid and sensitive detection of feline herpesvirus-1 using fluorescent microspheres as labels for immunochromatographic test strips. *Vet Res Commun*. 2026. https://pubmed.ncbi.nlm.nih.gov/41779066/ [23] Gareis H, Schulz B. Evaluation of amyloid A and haptoglobin in the serum of cats with respiratory diseases. *Front Vet Sci*. 2026. https://pubmed.ncbi.nlm.nih.gov/42109870/ [24] Fujiwara-Igarashi A, Nakazawa Y, Ohshima T, et al. Construction of a Diagnostic Prediction Model for Feline Nasal and Nasopharyngeal Diseases in Japan Using Noninvasive Examinations. *Vet Med Sci*. 2025. https://pubmed.ncbi.nlm.nih.gov/40104847/ [25] Doğan F, Acar G, Fedai T, et al. Investigation of the presence of gammaherpesvirus infections in cats with and without upper respiratory tract disease. *Comp Immunol Microbiol Infect Dis*. 2026. https://pubmed.ncbi.nlm.nih.gov/42035571/ [26] Kwan E, Legione AR, Hartley CA, et al. Transcriptomic analysis of Crandell-Rees feline kidney cell infections with field and vaccine feline calicivirus strains. *Virus Res*. 2026. https://pubmed.ncbi.nlm.nih.gov/41435987/ ## Related Clinical & Scientific Guides * [Duck Diseases: A Comprehensive Overview for Veterinary Practitioners](/knowledge/bacteria/general/duck-diseases-comprehensive-overview-veterinary) * [Salmonella Dublin in Cattle: Emerging Pathogen, Diagnostic Challenges, and Public Health Impact](/knowledge/bacteria/general/salmonella-dublin-cattle-emerging-pathogen-diagnostic-public-health) * [Mycoplasma Infections in Poultry: Vaccination Strategies and Control Programs](/knowledge/bacteria/general/mycoplasma-infections-in-poultry-vaccination-strategies-and-control-programs)