Nowadays, due to technology development, people are getting modernised. But as they get modernised, they also develop new diseases. The more we get modernised, the more we are diseased. Hence nowadays it has become difficult for doctors to distinguish the disease caused by bacteria and the disease caused by the virus. For example, if a person is having the symptoms of TB and coughs up blood and another person has the symptoms of cancer and coughs up blood.so in both the cases the diseases are different but the symptom is same. Is this case the doctor will probably ask the patients to take a blood test or a chest x-ray. This process may take a day or two for the reports to come by which cancer may reach its last stage (though the cancer is already noticed only at the last stage). Thus though the technology in medicine has developed to the 8th generation level, still we haven’t achieved a halt in delayed diagnosis. According to WHO, in 1968, we had a situation of human beings going almost extinct due to the outbreak of deadly disease “swine flu”. This flu is actually caused by the type A influenza virus in pigs which gets transmitted to human beings through direct contact. So doctors took time to find whether it is a bacterial disease or a viral one. But due to early precaution and prevention, we survived to overcome this flu. Also now certain diseases like smallpox have been eradicated from India due to repeated vaccination of all newborn babies. This stage has been achieved only due to precautions.