most of the doctors sterilize the equipment in a solution which is kept on their examination desk. you have not mentioned the time duration between exposure and the onset of symptoms though hiv does not cause throat inflammation as a presenting symptom usually. still you can have to get a hiv dna or rna pcr (polymerase chain reaction) test done to rule out any chance of acquiring an infection. for further doubts consult a hiv aids specialist online --><link>
can hiv cause throat inflammation as a presenting symptom?