This is Dr Basu, experienced Internal Medicine Specialist.
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Has she been on right antibiotic after culture?
Complete resolution of infection is important.
Low sodium can be due to the antibiotic side effect or from the infection related.
Current weakness can be due to the recent infection commonly.
Also kidney failure can be possible.
That should be checked.
Kidney ultrasound is important.
Other possibilities include diabetes which can cause frequent resistant infections.
Hypothyroidism is another possibility.
Iron deficiency also should be ruled out.
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