The chart below lists 35 diseases associated with XMRV infection. If you have any of these, you may want to think long and hard before you line up for an mRNA COVID-19 vaccine, as your chances of severe side effects or death are likely far higher than someone who does not have any of these diseases. This is not a complete list. There may be many other conditions that can put you into a high-risk category. One example is idiopathic thrombocytopenia (ITP), a deadly bleeding disorder.