The incident occurred on Sunday in the south of Brazil.
The 43-year-old was hit in the head by fragments of metal.
His health has been an issue during his presidency.
The infected piercing led to the 15-year-old suffering four heart attacks.
The internet is amazed and alarmed.
A police officer is among the dead.
The Brazilian leader's comments could herald a rocky start in relations with Biden.
Manoel Moisés Cavalcante died from a heart attack on August 14.