Title:Sertések légzőszervi megbetegedéseinek elkülönítő kórjelzése II. A növendék malacok megbetegedései
Summary The authors describe the pathogenesis and differential diagnosis of important porcine respiratory diseases, based on the available literature and on their prac tical experiences. Aiming to help clinicians to identify respiratory conditions pos sibly „on the spot”, different diseases are discussed according to the production phase they likely to occur in, and also according to the elicited clinical signs. In the second part of this multi volume article, respiratory diseases in the growing period are detailed. Readers are encouraged to consult the first volume of this series as basic information on clinical signs, pathological lesions, sampling and diagnostics of certain respiratory conditions are not repeated here for the sake of conciseness. Clinical examination of grower age groups is the first step to diagnosis. The ani mals’ response to environmental stimuli should be assessed. Important to note, whether the respiratory signs are present in all age groups, or only observed in certain batches (e. g. epidemic swine influenza versus Mycoplasma hyorhinis infection). Common lesions in animals affected with respiratory signs include bronchopneumonia, interstitial pneumonia etc. Ear tip necrosis related embolic pneumonia, and polyserositis due to either one or more of Haemophilus para suis, Mycoplasma hyorhinis or Streptococcus suis are common findings in growers, being usually less frequent in suckling piglets or fatteners. One should not skip examination of non-respiratory organs (spleen, intestines etc.) as they might have important clues to diagnosis. Serological “profiling” as part of supplemen tary examinations has a limited role in the grower phase: depletion of colostral antibodies can be detected in case of most pathogens but seroconversion to them would occur usually later, in the finishing phase. However, early serocon version to e. g. Mycoplasma hyopneumoniae would indicate an important devia tion from “usual” and would be an asset to diagnosis. Classical respiratory prob lems like PRRS, swine influenza, Glässer’s disease and less studied syndromes as Acute Respiratory Distress Syndrome, ear tip necrosis related embolic pneu monia and Pneumocystis carinii infection are discussed in details.