<s>[INST] Hello:  I am very concerned about my sister.  She is 48 years old and has been sick for 2.5 week.  She was diagnosed with influenza, but isnt getting any better.  Shes been running fevers up to 103, has a d-dimer of 798, night sweating, shortness of breath and very fatigued.  She was given a chest x-ray today, that was clear.  If no better tomorrow, her doc. said she has to have CT scan performed.  She is a nurse so knows a lot about what could be going on.  Could she have a blood clot? [/INST] Hellos you mentioned that she is having "influenza" and all these symptoms are also an indication of influenza. Abrupt onset of fever, severe myalgic / arthralgia, severe Chat Doctor. But the main question is type of influenza, so that proper medicine could be given.1 Seasonal influenza.2 Avian influenza.3 Novel H₁ N1 influenza. Since you mentioned that your sister is a nurse, so it is very difficult to say, which type of influenza, she is having. Tests are performed for detection of type of influenza. Immunofluorescence test &Hemagglutination inhibition tests. So first get in these tests so that exact type of influenza can establish. As far she may have blood clot?  Your query, it is very difficult to say anything because of short history of illness. So deal as I mentioned above. </s>