How one Utah man contracted the Zika virus remains a mystery

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Experts with the Centers for Disease Control and Prevention (CDC) have concluded their investigation into an "unusual" case of Zika in Utah, but still do not know how the man, who was exposed to no known means of transmission, contracted the virus.

The man had not traveled to a hotspot, nor had he engaged in sexual intercourse with an infected person.

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However, he did care for an elderly "family contact" suffering from a particularly robust and ultimately fatal Zika infection.

The man had close contact (hugging and kissing) with the elderly patient, but according to CDC, "...it is not certain that these types of close contact were the source of transmission."

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Therapist Rozely Fontoura holds Juan Pedro, who has microcephaly, in Recife, Brazil March 26, 2016. When Daniele Santos gave birth to a baby boy with microcephaly, a serious birth defect linked to the Zika infection, she was distraught. She was left to look after Juan Pedro alone after her husband left. In addition to traditional treatment at a hospital in Recife, Santos is learning therapeutic massage from an NGO to help alleviate Pedro's symptoms. REUTERS/Paulo Whitaker SEARCH "PEDRO PAULO" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Daniele Santos (R) holds her baby Juan Pedro, who has microcephaly, with therapist Rozely Fontoura in her home in Recife, Brazil March 26, 2016. When Santos gave birth to a baby boy with microcephaly, a serious birth defect linked to the Zika infection, she was distraught. She was left to look after Juan Pedro alone after her husband left. In addition to traditional treatment at a hospital in Recife, Santos is learning therapeutic massage from an NGO to help alleviate Pedro's symptoms. REUTERS/Paulo Whitaker SEARCH "PEDRO PAULO" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Daniele Santos is reflected in a mirror while she jokes with her baby Juan Pedro, who has microcephaly, in Recife, Brazil March 26, 2016. When Santos gave birth to a baby boy with microcephaly, a serious birth defect linked to the Zika infection, she was distraught. She was left to look after Juan Pedro alone after her husband left. In addition to traditional treatment at a hospital in Recife, Santos is learning therapeutic massage from an NGO to help alleviate Pedro's symptoms. REUTERS/Paulo Whitaker SEARCH "PEDRO PAULO" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Daniele Santos (L) holds her baby Juan Pedro, who has microcephaly, as she talks with therapist Rozely Fontoura in front of her house, in Recife, Brazil March 26, 2016. When Santos gave birth to a baby boy with microcephaly, a serious birth defect linked to the Zika infection, she was distraught. She was left to look after Juan Pedro alone after her husband left. In addition to traditional treatment at a hospital in Recife, Santos is learning therapeutic massage from an NGO to help alleviate Pedro's symptoms. REUTERS/Paulo Whitaker SEARCH "PEDRO PAULO" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Therapist Rozely Fontoura (L) teaches Daniele Santos Shantala massage on her baby Juan Pedro, who has microcephaly, in Recife, Brazil March 26, 2016. When Santos gave birth to a baby boy with microcephaly, a serious birth defect linked to the Zika infection, she was distraught. She was left to look after Juan Pedro alone after her husband left. In addition to traditional treatment at a hospital in Recife, Santos is learning therapeutic massage from an NGO to help alleviate Pedro's symptoms. REUTERS/Paulo Whitaker SEARCH "PEDRO PAULO" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Therapist Rozely Fontoura (R) teaches Daniele Santos to put her baby Juan Pedro in a sling in her home in Recife, Brazil March 26, 2016. When Santos gave birth to a baby boy with microcephaly, a serious birth defect linked to the Zika infection, she was distraught. She was left to look after Juan Pedro alone after her husband left. In addition to traditional treatment at a hospital in Recife, Santos is learning therapeutic massage from an NGO to help alleviate Pedro's symptoms. REUTERS/Paulo Whitaker SEARCH "PEDRO PAULO" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Daniele Santos holds her baby Juan Pedro, who has microcephaly, while washing dishes in her home in Recife, Brazil March 26, 2016. When Santos gave birth to a baby boy with microcephaly, a serious birth defect linked to the Zika infection, she was distraught. She was left to look after Juan Pedro alone after her husband left. In addition to traditional treatment at a hospital in Recife, Santos is learning therapeutic massage from an NGO to help alleviate Pedro's symptoms. REUTERS/Paulo Whitaker SEARCH "PEDRO PAULO" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Therapist Rozely Fontoura (L) teaches Daniele Santos Shantala massage on her baby Juan Pedro, who has microcephaly, in Recife, Brazil March 26, 2016. When Santos gave birth to a baby boy with microcephaly, a serious birth defect linked to the Zika infection, she was distraught. She was left to look after Juan Pedro alone after her husband left. In addition to traditional treatment at a hospital in Recife, Santos is learning therapeutic massage from an NGO to help alleviate Pedro's symptoms. REUTERS/Paulo Whitaker SEARCH "PEDRO PAULO" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY TPX IMAGES OF THE DAY
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Further, the roughly dozen other people who had similar contact with the affected person did not get sick.

As part of their research, CDC personnel also took a sampling of local mosquitoes, but determined that neither of the two species connected to the transmission of the Zika virus exist in the area.

While it is a mystery how the man contracted the Zika virus, he did fully recover from it.

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