I am a specialist in paediatric infectious diseases. I am competent to accept instructions in all matters dealing with transmission, pathogenesis & sequelae of most infections seen in developed countries (including HIV/AIDS). I have a particular interest in tuberculosis, HIV & infections in the immune compromised. Although I only deal with a limited number of neonates in my practice, I am still competent in this area.

Dr Machin has interests in clinical microbiology and clinical virology. In particular, he has expertise in the diagnosis and management of viral infections in sexual health, solid organ and haematological transplant and critically ill patients. Additionally, in the diagnosis and management of emerging viral infections, having been involved in the recent COVID-19 pandemic and Monkeypox outbreak. He has a specialist interest in infection prevention and control of viral infections in hospital settings.