This quasi-experimental study aims to evaluate the efficacy and safety of pulmonary rehabilitation in post-COVID-19 patients and compare differences in primary outcomes before and after pulmonary rehabilitation. Its main aim is to provide an answer to the following question: What are the outcomes of pulmonary rehabilitation in post-COVID-19 patients in a tertiary care facility in Bangladesh? The participants will participate in 06 weeks of comprehensive multimodal and multidisciplinary outpatient pulmonary rehabilitation, including endurance training, strength training, patient education, relaxation techniques, psychological support, and nutritional counseling.

Background: The 2019 novel coronavirus, belonging to the β species of coronaviruses, primarily spreads through respiratory droplets and close contact. Even after recovering from the infection, COVID-19 can lead to various chronic health issues, with impaired lung function, reduced exercise performance, and diminished quality of life being prevalent among a significant proportion of patients. In Bangladesh, post-COVID-19 patients represent a considerable population who have overcome the acute phase of the infection but continue to face numerous social, psychological, and physical challenges. Among these challenges, respiratory complications such as persistent cough, shortness of breath, and decreased lung function are frequently observed in post-COVID-19 patients in Bangladesh. In addition, these individuals often experience fatigue, muscle weakness, and joint pain. These physical symptoms can profoundly impact their daily activities and overall quality of life, necessitating ongoing medical care and rehabilitation.

Purpose: To evaluate the efficacy of pulmonary rehabilitation in post-COVID-19 patients and to compare differences in outcomes between before and after pulmonary rehabilitation Methodology: It will be a hospital-based quasi-experimental study. The investigator will conveniently select adult post-COVID-19 patients whose respiratory symptoms (fatigue, exertional dyspnea, etc.) persist longer than 12 weeks from the onset of their first symptoms from outpatient and inpatient of the Department of Respiratory Medicine, Bangabandhu Sheikh Mujib Medical University. Participants will participate in a 06-weeks (Two sessions per week) comprehensive multimodal and multidisciplinary outpatient pulmonary rehabilitation. In-person interviews will be done for data collection. The total sample size will be 130. Before the study, the research protocol will be approved by the Institutional Review Board (IRB) of Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka.

Expected outcome: The study's findings will reveal the benefits of pulmonary rehabilitation among post-COVID-19 patients.

Inclusion Criteria:

• Previously RT-PCR positive for SARS-COV-2 and whose respiratory symptoms (fatigue, exertional shortness of breath and cough) persists more than 3 weeks after the onset of their first symptoms attending outpatient and admitted inpatient under the department of Respiratory Medicine, Bangabandhu Sheikh Mujib Medical University, Bangladesh

Exclusion Criteria:

• RT-PCR negative but respiratory symptoms (fatigue, exertional shortness of breath and cough) persists more than 3 weeks after the onset of their first symptoms
• RT-PCR positive but respiratory symptoms (fatigue, exertional shortness of breath and cough) not persists more than 3 weeks after the onset of their first symptoms
• Comorbidities like chronic lung disease, obstructive sleep apnea, coronary heart disease, chronic kidney disease, stroke