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Background: Differentiation of M. tuberculosis complex organisms were assigned to one of three genotypic groups based on the combinations of polymorphisms at katG codon 463 and gyrA codon 95. Early identification of strains belonging to any particular group is very important. This study was planned to identify major genetic groups of clinically isolated Mycobacterium tuberculosis. Materials and Methods: In this cross sectional study 33 sputum samples were collected from tuberculosis patients of the Markazi province. DNA purification from isolated samples was performed by Chelex 100. Identification of isolates was confirmed by detection of katG gene and the mutation in KatG463 by using PCR method and RFLP respectively. Finally 620-bp of katG gene and 194-bp of gyrA gene purified from PCR product were sequenced. Results: Amplification of 620-bp fragment of katG gene was a good way to confirm the detection of bacteria as a molecular approach. Results of sequencing codon GyrA95 in combination by results of PCR-RFLP determined type of the major genetic group (MGG). Therefore it showed that among the 33 Mycobacterium tuberculosis isolates 12 samples were MGG 1, 15 Samples were MGG2 and 6 samples were MGG 3. Results revealed that MGG 2 was dominant form of M. tuberculosis strains of Markazi province by frequency of 45.5%. Conclusion: Based on the results of this study MGG2 occurrence was more frequent among clinical strains in Markazi province that its accordance with susceptibility of these strains to conventional antibiotics is notable. In this study, three applicable benefits from the test as: MGG typing, molecular detection of M. tuberculosis and bacterial resistance to Isoniazid were proven.

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Introduction: The Symptoms of Omicron are still unknown. Primary data show that the Omicron symptoms are mainly related to the respiratory system, including runny nose, sore throat, headache, fatigue, and sneezing. Based on the need for more evidence about Omicron symptoms, this study was conducted to investigate the symptoms of this COVID serotype.
Methods: This descriptive-analytical cross-sectional study was performed for 6 months in Arak city on 160 definitively diagnosed patients with Omicron. For all patients who entered the study, the information evaluation checklist, including demographics and symptoms (24 symptoms), was completed. Disease diagnosis was done by PCR.
Results: The disease of 55% of people was mild, 35% moderate, and 10% severe. Fifty-one people (31.9%) mentioned a history of previous infection with COVID-19. Pulmonary involvement, the type of drug used, and anxiety at the time of infection were related to the severity of the disease (P < 0.05). The five most common symptoms of Omicron (%) were sore throat (86.3), cough (82.5), weakness and lethargy (76.3), headache (72.5) and dry mouth (62.5). There was also a relationship between old age with dry mouth and headache, underlying disease with sneezing, anxiety during illness with joint pain and chest pain, and smoking with abdominal pain (P < 0.05).
Conclusions: The most common symptoms included sore throat, cough, weakness and lethargy, headache, and musculoskeletal pain. However, reduced smell and taste, night sweats, fever, and joint pain, common in the previous serotypes, were among the less frequent symptoms of Omicron.