DiagnosisTravel history is no longer valid as a criterion to build a diagnosisbecause local transmission accounts for most cases ofacquisition of infection in locations where no cases have beenpreviously identified. Clinical manifestations accompanied byradiographic evaluation and laboratory diagnosis (detection ofvirus RNA) are the only possible approach for definitive diagnosis[50]. Generalizations regarding symptoms and laboratoryindices still cannot be made because SARS-CoV-2 pathologyand its clinical picture are still not completely understood.Because of variations in epidemiology and clinical features ofSARS-CoV-2 infections, physicians and specialists are stronglyrecommended to continually update their management strategieson the basis of WHO interim guidelines for diagnosis andcases definitions (suspected, probable and confirmed).The most convenient laboratory tests for SARS-CoV-2diagnosis is real-time reverse transcriptase PCR of nasopharyngealspecimens. A regularly updated source for various protocols that are based on real-time reverse transcriptasePCR assay is available online via the WHO [51]. As in anydiagnostic test, false-positive and false-negative results havebeen reported, but at a very low frequency [30]. According torecommendations of the US Centers for Disease Control andPrevention, accepted clinical specimens are bronchoalveolarlavage fluid, nasopharyngeal swabs (but not throat swabs) andblood [52]. Bronchoalveolar lavage fluid samples were found tobe better than other respiratory specimens (positive rate 93%),followed by sputum samples (72%), nasal swab (63%), fibrobronchoscopebrush biopsy samples (46%), pharyngeal swab(32%) and faeces (29%) [53]. As a result of the increasingnumber of healthcare-associated infections, strict adherence touse of personal protective equipment and precautions againstairborne pathogens is highly recommended. A concise guide forhealthcare staff, researcher and public health workers has beenpublished [54].
Diagnosis<br>Travel history is no longer valid as a criterion to build a diagnosis<br>because local transmission accounts for most cases of<br>acquisition of infection in locations where no cases have been<br>previously identified. Clinical manifestations accompanied by<br>radiographic evaluation and laboratory diagnosis (detection of<br>virus RNA) are the only possible approach for definitive diagnosis<br>[50]. Generalizations regarding symptoms and laboratory<br>indices still cannot be made because SARS-CoV-2 pathology<br>and its clinical picture are still not completely understood.<br>Because of variations in epidemiology and clinical features of<br>SARS-CoV-2 infections, physicians and specialists are strongly<br>recommended to continually update their management strategies<br>on the basis of WHO interim guidelines for diagnosis and<br>cases definitions (suspected, probable and confirmed).<br>The most convenient laboratory tests for SARS-CoV-2<br>diagnosis is real-time reverse transcriptase PCR of nasopharyngeal<br>specimens. A regularly updated source for various protocols that are based on real-time reverse transcriptase<br>PCR assay is available online via the WHO [51]. As in any<br>diagnostic test, false-positive and false-negative results have<br>been reported, but at a very low frequency [30]. According to<br>recommendations of the US Centers for Disease Control and<br>Prevention, accepted clinical specimens are bronchoalveolar<br>lavage fluid, nasopharyngeal swabs (but not throat swabs) and<br>blood [52]. Bronchoalveolar lavage fluid samples were found to<br>be better than other respiratory specimens (positive rate 93%),<br>followed by sputum samples (72%), nasal swab (63%), fibrobronchoscope<br>brush biopsy samples (46%), pharyngeal swab<br>(32%) and faeces (29%) [53]. As a result of the increasing<br>number of healthcare-associated infections, strict adherence to<br>use of personal protective equipment and precautions against<br>airborne pathogens is highly recommended. A concise guide for<br>healthcare staff, researcher and public health workers has been<br>published [54].
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