Thanks for your question on HCM. By your history and description, I think it is viral infection (viral bronchitis) which is transmitting and gives you breathing difficulty. Virus spread by droplet infection. Infected person , by coughing and sneezing, discharges virus containing droplets in the environment. Healthy persons inhale these droplets and can develop similar kind of viral infection. So mostly at your work place, people are getting this viral infection through droplet infection by coughing and sneezing. So take your medicines regularly and wear mask so that droplet infection can be prevented.