Thanks for your question on HCM. Bilateral heasiness in lungs can be seen in transudative consitions more than exudative conditions. Transudative conditions like hypoprotienemia, liver disease, heart disease etc. In this body water tend to accumulate in lungs and gives bilateral hazziness. Exudative causes are viral pneumonia, ARDS , other severe bacterial pneumonia etc. In routine practice bilateral lower zone hazziness is seen more common in transudatives. If doubt about diagnosis I am suggesting you to go for CT thorax. This will give you clear cut idea about infection present or not. You can also send sputum for culture and sensitivity. This wil isolate the causative organism and help in guiding antibiotics. So discuss these things with your doctor.