Name 2 combined vaccine.
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ᴛʜᴇ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ ᴏғ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴ ᴠᴀᴄᴄɪɴᴇs ғᴏʀ ᴘʀᴏᴛᴇᴄᴛɪᴏɴ ᴀɢᴀɪɴsᴛ ᴍᴜʟᴛɪᴘʟᴇ ᴅɪsᴇᴀsᴇs ʙᴇɢᴀɴ ᴡɪᴛʜ ᴛʜᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴ ᴏғ ɪɴᴅɪᴠɪᴅᴜᴀʟ ᴅɪᴘʜᴛʜᴇʀɪᴀ, ᴛᴇᴛᴀɴᴜs, ᴀɴᴅ ᴘᴇʀᴛᴜssɪs (ᴅᴛᴘ) ᴠᴀᴄᴄɪɴᴇs ɪɴᴛᴏ ᴀ sɪɴɢʟᴇ ᴘʀᴏᴅᴜᴄᴛ; ᴛʜɪs ᴄᴏᴍʙɪɴᴇᴅ ᴠᴀᴄᴄɪɴᴇ ᴡᴀs ғɪʀsᴛ ᴜsᴇᴅ ᴛᴏ ᴠᴀᴄᴄɪɴᴀᴛᴇ ɪɴғᴀɴᴛs ᴀɴᴅ ᴄʜɪʟᴅʀᴇɴ ɪɴ 1948.
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