本帖最后由 choi 于 6-29-2019 09:44 编辑
(d) "After the operation [to remove lung nodules, by a thoracic surgeon], a new doctor, a specialist in infectious diseases, brought the results. I have good news and bad news, he told them. The good news — it's definitely not cancer. The bad news is that we still don't know what it is. * * * A few days later, the doctor conveyed something closer to a final diagnosis. It was a fungus [fungus takes longer time to grow in a lab than bacteria], though the lab still wasn't sure which one. It was either Blastomycosis [endemic to eastern US but not in Connecticut; caused by Blastomyces dermatitidis] or Cryptococcus [because it takes longer for a fungus to bear spores, by which the diagnosis can be made for certain, for different fungi bear vastly different spores under microscope]. Both are found in the environment, usually in moist soil [everywhere in the world] * * * as soon as the infected tissue was out of the man's body, his pain disappeared * * * As he [Quan] sees it, this man’s immune system, activated by infection in his lungs, mistakenly began attacking the man's muscles, along with properly going after the fungus. Once the bugs were gone, and his immune system went back to normal, the attack, and thus the pain, stopped, probably forever."
(i) First of all, it is hard to comprehend why this old man contracted the fungal disease, which affects mostly people who takes immunosuppressive drugs. See
Baddley JW et al, Geographic Distribution of Endemic Fungal Infections among Older Persons, United States. Emerging Infectious Diseases (published by CDC), 17: 1664 (2011)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3322071/
("Fungal infections have become an increasing problem for older persons in the United States. Compared with years past, older adults today are more likely to be considered for transplantation, receive aggressive regimens of chemotherapy, or take immunosuppressive drugs for rheumatologic or autoimmune diseases") (citations omitted0.
(ii) What Dr Quan sees, it is all speculation: there was no pathologic biopsy of muscles or joints, no blood test for autoantibodies (antibodies against muscle or joint). And most important, there is nothing in medical literature that says these fungal diseases will cause autoimmune disease or muscle or joint pains. Why propose autoimmune reaction? Even if some of these fungal disease cause muscle or joint pain, can it be possible that the fungus release toxin(s) which causes muscle or joint pains directly (without triggering patient's own immune system to attack muscles or joints)? Another problem to propose autoimmune reaction to a fungal disease is that there must be something common in antigens between the fungus and muscle or joint, which is hard to believe.
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