Interaction with domestic sheep and goats maybe linked to bighorn sheep populations developing pneumonia. Pneumonia in bighorn sheep is often fatal and can affect all age groups within a herd.
Preliminary disease mortality estimates range from 50-80% of individuals within affected herds. The potential exists for surviving bighorn sheep to serve as carriers, and populations that experience outbreaks subsequently have low recruitment of lambs, as reported by South Dakota’s Custer State Park. A variety of bacterial pathogens have previously been identified in the pneumoniacomplex, including Mycoplasma spp., Pasturella multocida, Pasturella trehalosi, and Mannheimia haemolytica, in addition to respiratory viruses and lungworm infections. Pneumonia is a challenging issue for bighorn sheep managers because of the difficulty associated with identifying the disease agent, remote locations, and limited management options.
--National Wildlife Health Center Newsletter
Respiratory disease, behavior, and survival of mountain goat kids
Pneumonia in bighorn sheep: Risk and resilience
Contact and contagion: Probability of transmission given contact varies with demographic state in bighorn sheep
Structured decision making for managing pneumonia epizootics in bighorn sheep
Modeling risk of pneumonia epizootics in bighorn sheep
Disease and predation: Sorting out causes of a bighorn sheep (Ovis canadensis) decline
Using structured decision making to manage disease risk for Montana wildlife
Use of exposure history to identify patterns of immunity to pneumonia in bighorn sheep (Ovis canadensis)
Prevalence of Mycoplasma ovipneumoniae in desert bighorn sheep in Arizona
Respiratory disease, behavior, and survival of mountain goat kidsBacterial pneumonia is a threat to bighorn sheep (Ovis canadensis) populations. Bighorn sheep in the East Humboldt Mountain Range (EHR), Nevada, USA, experienced a pneumonia epizootic in 2009–2010. Testing of mountain goats (Oreamnos americanus) that were captured or found dead on this range during and after the epizootic detected bacteria commonly associated with bighorn sheep pneumonia die‐offs.
Pneumonia in bighorn sheep: Risk and resilienceInfectious disease was an important driver of historic declines and extirpations of bighorn sheep (Ovis canadensis) in North America and continues to impede population restoration and management. Domestic sheep have long been linked to pneumonia outbreaks in bighorn sheep and this association has now been confirmed in 13 captive commingling experiments. However, ecological and etiological complex
Contact and contagion: Probability of transmission given contact varies with demographic state in bighorn sheepUnderstanding both contact and probability of transmission given contact are key to managing wildlife disease. However, wildlife disease research tends to focus on contact heterogeneity, in part because the probability of transmission given contact is notoriously difficult to measure. Here, we present a first step towards empirically investigating the probability of transmission given contact in f
Structured decision making for managing pneumonia epizootics in bighorn sheepGood decision-making is essential to conserving wildlife populations. Although there may be multiple ways to address a problem, perfect solutions rarely exist. Managers are therefore tasked with identifying decisions that will best achieve desired outcomes. Structured decision making (SDM) is a method of decision analysis used to identify the most effective, efficient, and realistic decisions whil
Modeling risk of pneumonia epizootics in bighorn sheepPneumonia epizootics are a major challenge for management of bighorn sheep (Ovis canadensis) affecting persistence of herds, satisfaction of stakeholders, and allocations of resources by management agencies. Risk factors associated with the disease are poorly understood, making pneumonia epizootics hard to predict; such epizootics are thus managed reactively rather than proactively. We developed a
Disease and predation: Sorting out causes of a bighorn sheep (Ovis canadensis) declineEstimating survival and documenting causes and timing of mortality events in neonate bighorn sheep (Ovis canadensis) improves understanding of population ecology and factors influencing recruitment. During 2010–2012, we captured and radiocollared 74 neonates in the Black Hills, South Dakota, of which 95% (70) died before 52 weeks of age. Pneumonia (36%) was the leading cause of mortality followed
Using structured decision making to manage disease risk for Montana wildlifeWe used structured decision-making to develop a 2-part framework to assist managers in the proactive management of disease outbreaks in Montana, USA. The first part of the framework is a model to estimate the probability of disease outbreak given field observations available to managers. The second part of the framework is decision analysis that evaluates likely outcomes of management alternatives
Use of exposure history to identify patterns of immunity to pneumonia in bighorn sheep (Ovis canadensis)Individual host immune responses to infectious agents drive epidemic behavior and are therefore central to understanding and controlling infectious diseases. However, important features of individual immune responses, such as the strength and longevity of immunity, can be challenging to characterize, particularly if they cannot be replicated or controlled in captive environments. Our research on b
Prevalence of Mycoplasma ovipneumoniae in desert bighorn sheep in ArizonaTo assess the potential for an epizootic of pneumonia to result from either natural immigration or translocation, we compared the seroprevalence to Mycoplasma ovipneumoniae in several populations of desert bighorn sheep in Arizona. We collected blood samples and nasal or oropharyngeal swabs from 124 desert bighorn sheep (Ovis canadensis nelsoni) from 6 populations in Arizona in 2009 and 2010. M. o