What is WIDAL test??
Answers
Tʜᴇ Wɪᴅᴀʟ ᴛᴇsᴛ ɪs ᴏɴᴇ ᴍᴇᴛʜᴏᴅ ᴛʜᴀᴛ ᴍᴀʏ ʙᴇ ᴜsᴇᴅ ᴛᴏ ʜᴇʟᴘ ᴍᴀᴋᴇ ᴀ ᴘʀᴇsᴜᴍᴘᴛɪᴠᴇ ᴅɪᴀɢɴᴏsɪs ᴏғ ᴇɴᴛᴇʀɪᴄ ғᴇᴠᴇʀ, ᴀʟsᴏ ᴋɴᴏᴡɴ ᴀs ᴛʏᴘʜᴏɪᴅ ғᴇᴠᴇʀ. Aʟᴛʜᴏᴜɢʜ ᴛʜᴇ ᴛᴇsᴛ ɪs ɴᴏ ʟᴏɴɢᴇʀ ᴄᴏᴍᴍᴏɴʟʏ ᴘᴇʀғᴏʀᴍᴇᴅ ɪɴ ᴛʜᴇ Uɴɪᴛᴇᴅ Sᴛᴀᴛᴇs ᴏʀ ᴏᴛʜᴇʀ ᴅᴇᴠᴇʟᴏᴘᴇᴅ ᴄᴏᴜɴᴛʀɪᴇs, ɪᴛ ɪs sᴛɪʟʟ ɪɴ ᴜsᴇ ɪɴ ᴍᴀɴʏ ᴇᴍᴇʀɢɪɴɢ ɴᴀᴛɪᴏɴs ᴡʜᴇʀᴇ ᴇɴᴛᴇʀɪᴄ ғᴇᴠᴇʀ ɪs ᴇɴᴅᴇᴍɪᴄ ᴀɴᴅ ʟɪᴍɪᴛᴇᴅ ʀᴇsᴏᴜʀᴄᴇs ʀᴇϙᴜɪʀᴇ ᴛʜᴇ ᴜsᴇ ᴏғ ʀᴀᴘɪᴅ, ᴀғғᴏʀᴅᴀʙʟᴇ ᴛᴇsᴛɪɴɢ ᴀʟᴛᴇʀɴᴀᴛɪᴠᴇs. Wʜɪʟᴇ ᴛʜᴇ ᴍᴇᴛʜᴏᴅ ɪs ᴇᴀsʏ ᴛᴏ ᴘᴇʀғᴏʀᴍ, ᴄᴏɴᴄᴇʀɴs ʀᴇᴍᴀɪɴ ᴀʙᴏᴜᴛ ᴛʜᴇ ʀᴇʟɪᴀʙɪʟɪᴛʏ ᴏғ ᴛʜᴇ Wɪᴅᴀʟ ᴛᴇsᴛ. Iᴛ ɪs ɴᴏᴛ sᴘᴇᴄɪғɪᴄ ғᴏʀ ᴛʏᴘʜᴏɪᴅ ғᴇᴠᴇʀ ᴀɴᴅ ᴄᴀɴ ʙᴇ ᴘᴏsɪᴛɪᴠᴇ ᴡʜᴇɴ ᴀ ᴘᴇʀsᴏɴ ᴅᴏᴇs ɴᴏᴛ ʜᴀᴠᴇ ᴛʜᴇ ɪɴғᴇᴄᴛɪᴏɴ.
In 1896 and named after its inventor, Georges-Fernand Widal, is an indirect agglutination test for enteric fever or undulant fever whereby bacteria causing typhoid fever is mixed with a serum containing specific antibodies obtained from an infected individual
The Widal test is positive if TO antigen titer is more than 1:160 in an active infection, or if TH antigen titer is more than 1:160 in past infection or in immunized persons. A single Widal test is of little clinical relevance especially in endemic areas such as Indian subcontinent, Africa and South-east Asia.
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