What is the CDC recommended medication for the treatment of chlamydia?

Choice A reason:

Nagele's rule for calculating the estimated date of confinement (EDC) involves subtracting 3 months from the first day of the last menstrual period and adding 7 days. For February 13th, subtracting 3 months gives us November 13th, and adding 7 days gives us November 20th. This is the most accurate calculation for the estimated date of confinement.

Choice B reason:

This choice is not accurate according to Nagele's rule. Adding 7 days to November 13th would give November 20th, not November 27th.

Choice reason:

This choice is not accurate according to Nagele's rule. Adding 7 days to November 13th would give November 20th, not November 21st.

Choice D reason:

This choice is not accurate according to Nagele's rule. Subtracting 3 months from February 13th would give November 13th, not November 14th.

Choice A reason: Penicillin is not a correct option, as it is not effective against chlamydia. Penicillin is an antibiotic that works by inhibiting the cell wall synthesis of bacteria. However, chlamydia is an intracellular bacterium that does not have a cell wall and is resistant to penicillin.

Choice B reason: Acyclovir is not a correct option, as it is not effective against chlamydia. Acyclovir is an antiviral drug that works by inhibiting the DNA synthesis of viruses. However, chlamydia is a bacterium, not a virus, and is not affected by acyclovir².

Choice C reason: Doxycycline is the correct option, as it is one of the recommended medications for the treatment of chlamydia. Doxycycline is a tetracycline antibiotic that works by inhibiting the protein synthesis of bacteria. It can penetrate the cells and kill chlamydia by interfering with its growth and reproduction. The CDC recommends a 7-day course of doxycycline (100 mg orally twice a day) for the treatment of uncomplicated chlamydia infection.

Choice D reason: Podofilox is not a correct option, as it is not effective against chlamydia. Podofilox is a topical medication that works by destroying the tissue of genital warts caused by human papillomavirus (HPV). However, chlamydia is a different infection that does not cause genital warts and is not treated by podofilox.