Simon J. Pelham is an immunologist based in Sydney, working at St. Vincent's Clinical School in Sydney, NSW 2052, Australia.
Immunology can sound a bit technical, but the work is very real and very personal. Simon helps people who have immune system problems, where the body’s normal defence system doesn’t work the way it should. In many cases, this can show up as frequent infections, ongoing inflammation, or issues that keep coming back.
His clinical focus includes immune conditions like Autosomal Dominant Hyper IgE Syndrome and Hyper IgE Syndrome. These can affect how the immune system responds, and they often need careful, ongoing support rather than a quick fix. He also looks after people with Common Variable Immune Deficiency (CVID). This is a long-term condition where the immune system doesn’t make enough of the proteins it needs to fight germs.
Simon also supports patients with Primary Immunodeficiency (PID). PID is a broad group of immune disorders. Some people have symptoms from childhood, while others only find out later on, after years of being told things were “just how it is” or after repeated health scares. Over time, the right immune work-up can make a big difference to how things are managed day to day.
Because immune conditions can be complex, care often needs to be steady and practical. Simon’s approach is about understanding what’s been happening, looking at test results in context, and working out a sensible plan for next steps. At times this may involve working with other clinicians and coordinating care so it all fits together for the person’s overall health.
For people living with immune problems, it can be hard to know what’s “normal” and what isn’t. Simon helps take some of that confusion away by explaining things in clear, down-to-earth language and focusing on what matters most for the individual and their family.
While immune disorders are not always rare, they are often under-recognised. Getting the diagnosis right can take time, and that’s why careful assessment is so important. Simon supports patients through that process, and continues to guide management as needs change.