different between aef vs cef

aef

aef From the web:

• what aef online
• what aefi
• what is aefi in immunization
• what is aefi report
• what does aef stand for
• what is aefi kit
• what is aefi surveillance
• what is aefm / usefm

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cef

cef From the web:

• what cefdinir used for
• what cefuroxime used for
• what ceftriaxone used to treat
• what cefdinir treats
• what cefr level is fluent
• what cefixime used for
• what cefr level is duolingo
• what ceftin used for