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Reduced Sense Of Smell, Post Nasal Drip. Citrobacter Koseri Found In Nasal Swab Test. Taking Sulfamethoxazole. Should I Worry About Transmitting The Infection?

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Posted on Sat, 30 Jun 2012
Question: for the past 3 years I can't smell(every great once in whileI can) and frequently feel like I was punched in the nose. I have post nasal drip. My ent took a nasal swab. Results came back 2+ citrobacter koseri. what is this and how did I get it. do I need to worry abount being around my pregnant daughter and a baby or my 86 year old mom. ENT prescribed sulfameth/trimethoprim. He too had not heard of citrobacter koseri.

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Answered by Dr. Aashish Raghu (2 hours later)
Hi there.

Thanks for the query.

It is possible you have rhinitis or inflammation of nose which can be caused by various causes. Certain bacteria like Citrobacter are usually normally present in the nose. Nasal tissue gets infected with this bacteria repeatedly and can cause problems like lack of smell, blocked nose.

This infection is known to spread from mother to the unborn baby and can cause complications. Kindly try to avoid close contact with your pregnant daughter as much as possible until the infection is eradicated by successful treatment with systemic antibiotics like Sulfamethoxazole and Trimethoprim.

Do continue and be done with the complete antibiotic course and get a nasal swab done after that to confirm eradication.

You may attempt steam inhalation to clear sinuses which may be infected causing post nasal drip.

I hope I have answered your query. I will be available to answer your follow up queries.

Wishing you good health.

Regards,






Above answer was peer-reviewed by : Dr. Yogesh D
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Answered by
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Dr. Aashish Raghu

Orthopaedic Surgeon

Practicing since :2011

Answered : 5448 Questions

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Reduced Sense Of Smell, Post Nasal Drip. Citrobacter Koseri Found In Nasal Swab Test. Taking Sulfamethoxazole. Should I Worry About Transmitting The Infection?

Hi there.

Thanks for the query.

It is possible you have rhinitis or inflammation of nose which can be caused by various causes. Certain bacteria like Citrobacter are usually normally present in the nose. Nasal tissue gets infected with this bacteria repeatedly and can cause problems like lack of smell, blocked nose.

This infection is known to spread from mother to the unborn baby and can cause complications. Kindly try to avoid close contact with your pregnant daughter as much as possible until the infection is eradicated by successful treatment with systemic antibiotics like Sulfamethoxazole and Trimethoprim.

Do continue and be done with the complete antibiotic course and get a nasal swab done after that to confirm eradication.

You may attempt steam inhalation to clear sinuses which may be infected causing post nasal drip.

I hope I have answered your query. I will be available to answer your follow up queries.

Wishing you good health.

Regards,