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  • Title: Clinical and serological outcomes in patients treated with oral doxycycline for early neurosyphilis.
    Author: Girometti N, Junejo MH, Nugent D, McOwan A, Whitlock G, 56 Dean Street Collaborative Group.
    Journal: J Antimicrob Chemother; 2021 Jun 18; 76(7):1916-1919. PubMed ID: 33783506.
    Abstract:
    OBJECTIVES: Penicillin-based antibiotic treatment for syphilis infection with CNS involvement (early neurosyphilis) is not always a suitable treatment option. We compared outcomes of patients diagnosed with early neurosyphilis and treated with doxycycline or procaine G penicillin. METHODS: Serological and clinical outcomes were analysed in patients diagnosed with early neurosyphilis between January 2015 and October 2019 at 56 Dean Street, a combined sexual health and HIV service based in London, UK. Acute onset of CNS, ocular and/or otic symptomatology and a documented seroconverting syphilis serology or a >4-fold increase in rapid plasma reagin ('RPR)' test titre within the previous 12 months were criteria used to define a case. Mann-Whitney U-test and χ2 tests were used to test distributions between baseline characteristics and outcomes according to treatment administered. RESULTS: Eighty-seven patients were included: median age = 35 years (IQR = 31-45), 98% MSM, 79% white ethnicity, 53% HIV-1 positive and 40% previously diagnosed with syphilis at any stage. They were treated exclusively with either intramuscular (IM) procaine G penicillin (71%) or oral doxycycline (18%). Patients received doxycycline treatment over a penicillin-based regimen due to IM treatment declined (31%), inability to attend for IM injections (31%) or penicillin allergy (19%). Serological response was achieved by all patients; 91% reported full symptom resolution at 30 days from end of treatment. Similar rates of clinical and serological response and seroreversion were observed in the groups treated with procaine G penicillin versus doxycycline. CONCLUSIONS: The clinical and serological outcomes seen with penicillin-based versus doxycycline treatments were similar. A randomized controlled trial is needed to establish the effectiveness of doxycycline in the treatment of early neurosyphilis.
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