LEVINSON, Judge.
Plaintiff appeals from an opinion and award of the North Carolina Industrial Commission denying plaintiffs Workers’ Compensation claim. We affirm.
Plaintiff was employed by the Town of Ayden, North Carolina, in 1980 in the water and sewer department. His initial job duties included tasks associated with installation, maintenance, and repair of the Town’s water and sewer system. In performing his duties, plaintiff was regularly exposed to raw sewage containing materials such as water, urine, feces, grease, feminine hygiene products, prophylactics, small amounts of blood, and other items and substances that people flush down toilets.
The sewage sometimes touched plaintiff’s skin or entered his eyes and mouth. When plaintiff had cuts or abrasions, the sewage came into contact with his broken skin. Plaintiff was promoted to foreman in 1984, and later to superintendent; after each promotion, his exposure to raw sewage became less frequent.
In 1992, liver function tests conducted during a physical examination of plaintiff indicated possible liver problems. Testing revealed that plaintiff did not have hepatitis A or B. In 1998, routine blood work for an unrelated problem also yielded abnormal liver function test results. Plaintiff’s physician referred him to Dr. Douglas F. Newton, an internist and gastroenterologist, who diagnosed plaintiff with hepatitis C. In Dr. Newton’s opinion, plaintiff had been infected for about six years and had acquired the infection due to contact with sewer water.
Plaintiff filed a workers’ compensation claim alleging that his hepatitis C was a compensable occupational disease as defined in N.C.G.S. § 97-53(13) (2001). In support of his claim, plaintiff offered Dr. Newton’s deposition testimony, in which the doctor offered an opinion that, to a reasonable degree of medical certainty, plaintiff was [639]*639likely infected with hepatitis C through work-related contact with sewage. Plaintiff also presented evidence that his wife of twenty-seven years had tested negative for hepatitis C, and testified that he had no history of blood transfusions, tattoos or intravenous drug use, and had not had extramarital sexual contact.
Defendant offered the deposition testimony of Dr. John F. Campbell, an expert in infectious diseases. Dr. Campbell never treated plaintiff; his testimony was based upon plaintiff’s job description and personnel file, interrogatories, and plaintiffs medical file. Dr. Campbell testified that he was unaware of any studies linking plaintiffs occupation with a greater-than-average risk of hepatitis C infection. Moreover, Dr. Campbell indicated that, while he could not determine the cause of plaintiffs hepatitis C, he saw no evidence of plaintiff contracting hepatitis C at work.
The Commission found, in pertinent part:
10. Because Dr. Newton attributed plaintiffs hepatitis to his exposure to sewage at work, plaintiff filed this workers’ compensation claim. Defendant then presented the issue to Dr. Campbell, an internist and infectious disease specialist who had worked for the Center for Disease Control for two years during his career. Dr. Campbell searched the medical literature and found no studies which showed Hepatitis C to be present in sewage or that sewage could transfer the virus. There was no scientific evidence to support the theory that sewer workers were at an increased risk of acquiring the infection and, in view of the large number of sewage systems and sewer workers, the doctor was of the opinion that the risk would have been noticed if it existed. Despite the large number of patients he had treated for Hepatitis C, Dr. Campbell had never had a patient claim to have contracted the disease from exposure to sewage.
11. Dr. Campbell explained that Hepatitis C is a virus which is transmitted through a blood borne route. . . . Hepatitis C is usually transmitted by shared intravenous needles, but there have been less frequent reports of sexual transmission and rare cases of cuts or punctures allowing the virus to enter the blood stream when exposed to infected blood. ... In addition, the Hepatitis C virus has a very short life span outside of the host, which has hampered research since it cannot be cultured. The fact that the Hepatitis C virus does not survive long outside the host renders transmission through sewer waste unlikely. There has been con[640]*640siderable effort in medicine to identify the routes of transmission for Hepatitis C. Contact with sewer waste has not been identified as a potential cause for Hepatitis C.
12. Dr. Newton was too quick to attribute plaintiffs condition to his exposure to sewage. Not only did Dr. Newton not have scientific authority to support his opinion, he could not base his opinion on his own experience in medical practice since he had not treated another sewer worker for Hepatitis C. In addition, as noted by Dr. Campbell, there are disincentives for patients to disclose the types of activities which could lead to infection.
13. Although plaintiff was exposed to untreated sewer water which would have contained some blood and although he worked at times with cuts or abrasions on his skin, he has not proven by the greater weight of the evidence to have been placed at an increased risk of developing Hepatitis C by reason of his exposure to untreated sewage in his employment with defendant. Nor was his exposure to untreated sewage proven to have been a significant contributing factor in his contraction of the disease.
14. Plaintiff has not proven that he developed an occupational disease which was due to causes and conditions characteristic of and peculiar to his employment with defendant employer and which excluded all ordinary diseases of life to which the general public was equally exposed.
The Commission made the following relevant conclusion of law:
1. Plaintiffs Hepatitis C was not an occupational disease which was due to causes and conditions characteristic of and peculiar to his employment with defendant-employer and which excluded all ordinary diseases of life to which the general public was equally exposed. Dr. Newton’s bald opinion is not accepted as credible evidence of causation because his opinion is not based on accepted medical principles of differential diagnosis and is not supported by the accepted medical literature.
(citations omitted).
The Full Commission, with one Commissioner dissenting, denied compensation. Plaintiff now appeals the Commission’s opinion and award, contending (1) the Commission erred in finding that plaintiff was not exposed to hepatitis C at work, and (2) the Commission erred [641]*641in concluding that plaintiffs hepatitis C infection was not caused by his employment.
Our review of the Commission’s opinion and award “is limited to a determination of (1) whether the Commission’s findings of fact are supported by any competent evidence in the record; and (2) whether the Commission’s findings justify its conclusions of law.” Goff v. Foster Forbes Glass Div., 140 N.C. App. 130, 132-33, 535 S.E.2d 602, 604 (2000). “The facts found by the Commission are conclusive upon appeal to this Court when they are supported by competent evidence, even when there is evidence to support contrary findings.” Pittman v. Int’l Paper Co., 132 N.C. App.
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LEVINSON, Judge.
Plaintiff appeals from an opinion and award of the North Carolina Industrial Commission denying plaintiffs Workers’ Compensation claim. We affirm.
Plaintiff was employed by the Town of Ayden, North Carolina, in 1980 in the water and sewer department. His initial job duties included tasks associated with installation, maintenance, and repair of the Town’s water and sewer system. In performing his duties, plaintiff was regularly exposed to raw sewage containing materials such as water, urine, feces, grease, feminine hygiene products, prophylactics, small amounts of blood, and other items and substances that people flush down toilets.
The sewage sometimes touched plaintiff’s skin or entered his eyes and mouth. When plaintiff had cuts or abrasions, the sewage came into contact with his broken skin. Plaintiff was promoted to foreman in 1984, and later to superintendent; after each promotion, his exposure to raw sewage became less frequent.
In 1992, liver function tests conducted during a physical examination of plaintiff indicated possible liver problems. Testing revealed that plaintiff did not have hepatitis A or B. In 1998, routine blood work for an unrelated problem also yielded abnormal liver function test results. Plaintiff’s physician referred him to Dr. Douglas F. Newton, an internist and gastroenterologist, who diagnosed plaintiff with hepatitis C. In Dr. Newton’s opinion, plaintiff had been infected for about six years and had acquired the infection due to contact with sewer water.
Plaintiff filed a workers’ compensation claim alleging that his hepatitis C was a compensable occupational disease as defined in N.C.G.S. § 97-53(13) (2001). In support of his claim, plaintiff offered Dr. Newton’s deposition testimony, in which the doctor offered an opinion that, to a reasonable degree of medical certainty, plaintiff was [639]*639likely infected with hepatitis C through work-related contact with sewage. Plaintiff also presented evidence that his wife of twenty-seven years had tested negative for hepatitis C, and testified that he had no history of blood transfusions, tattoos or intravenous drug use, and had not had extramarital sexual contact.
Defendant offered the deposition testimony of Dr. John F. Campbell, an expert in infectious diseases. Dr. Campbell never treated plaintiff; his testimony was based upon plaintiff’s job description and personnel file, interrogatories, and plaintiffs medical file. Dr. Campbell testified that he was unaware of any studies linking plaintiffs occupation with a greater-than-average risk of hepatitis C infection. Moreover, Dr. Campbell indicated that, while he could not determine the cause of plaintiffs hepatitis C, he saw no evidence of plaintiff contracting hepatitis C at work.
The Commission found, in pertinent part:
10. Because Dr. Newton attributed plaintiffs hepatitis to his exposure to sewage at work, plaintiff filed this workers’ compensation claim. Defendant then presented the issue to Dr. Campbell, an internist and infectious disease specialist who had worked for the Center for Disease Control for two years during his career. Dr. Campbell searched the medical literature and found no studies which showed Hepatitis C to be present in sewage or that sewage could transfer the virus. There was no scientific evidence to support the theory that sewer workers were at an increased risk of acquiring the infection and, in view of the large number of sewage systems and sewer workers, the doctor was of the opinion that the risk would have been noticed if it existed. Despite the large number of patients he had treated for Hepatitis C, Dr. Campbell had never had a patient claim to have contracted the disease from exposure to sewage.
11. Dr. Campbell explained that Hepatitis C is a virus which is transmitted through a blood borne route. . . . Hepatitis C is usually transmitted by shared intravenous needles, but there have been less frequent reports of sexual transmission and rare cases of cuts or punctures allowing the virus to enter the blood stream when exposed to infected blood. ... In addition, the Hepatitis C virus has a very short life span outside of the host, which has hampered research since it cannot be cultured. The fact that the Hepatitis C virus does not survive long outside the host renders transmission through sewer waste unlikely. There has been con[640]*640siderable effort in medicine to identify the routes of transmission for Hepatitis C. Contact with sewer waste has not been identified as a potential cause for Hepatitis C.
12. Dr. Newton was too quick to attribute plaintiffs condition to his exposure to sewage. Not only did Dr. Newton not have scientific authority to support his opinion, he could not base his opinion on his own experience in medical practice since he had not treated another sewer worker for Hepatitis C. In addition, as noted by Dr. Campbell, there are disincentives for patients to disclose the types of activities which could lead to infection.
13. Although plaintiff was exposed to untreated sewer water which would have contained some blood and although he worked at times with cuts or abrasions on his skin, he has not proven by the greater weight of the evidence to have been placed at an increased risk of developing Hepatitis C by reason of his exposure to untreated sewage in his employment with defendant. Nor was his exposure to untreated sewage proven to have been a significant contributing factor in his contraction of the disease.
14. Plaintiff has not proven that he developed an occupational disease which was due to causes and conditions characteristic of and peculiar to his employment with defendant employer and which excluded all ordinary diseases of life to which the general public was equally exposed.
The Commission made the following relevant conclusion of law:
1. Plaintiffs Hepatitis C was not an occupational disease which was due to causes and conditions characteristic of and peculiar to his employment with defendant-employer and which excluded all ordinary diseases of life to which the general public was equally exposed. Dr. Newton’s bald opinion is not accepted as credible evidence of causation because his opinion is not based on accepted medical principles of differential diagnosis and is not supported by the accepted medical literature.
(citations omitted).
The Full Commission, with one Commissioner dissenting, denied compensation. Plaintiff now appeals the Commission’s opinion and award, contending (1) the Commission erred in finding that plaintiff was not exposed to hepatitis C at work, and (2) the Commission erred [641]*641in concluding that plaintiffs hepatitis C infection was not caused by his employment.
Our review of the Commission’s opinion and award “is limited to a determination of (1) whether the Commission’s findings of fact are supported by any competent evidence in the record; and (2) whether the Commission’s findings justify its conclusions of law.” Goff v. Foster Forbes Glass Div., 140 N.C. App. 130, 132-33, 535 S.E.2d 602, 604 (2000). “The facts found by the Commission are conclusive upon appeal to this Court when they are supported by competent evidence, even when there is evidence to support contrary findings.” Pittman v. Int’l Paper Co., 132 N.C. App. 151, 156, 510 S.E.2d 705, 709, disc. review denied, 350 N.C. 310, 534 S.E.2d 596, aff’d per curiam, 351 N.C. 42, 519 S.E.2d 524 (1999). “[T]his Court is ‘not at liberty to reweigh the evidence and to set aside the findings . . . simply because other . . . conclusions might have been reached.’ ” Baker v. Sanford, 120 N.C. App. 783, 787, 463 S.E.2d 559, 562 (1995) (quoting Rewis v. Ins. Co., 226 N.C. 325, 330, 38 S.E.2d 97, 100 (1946)), disc. review denied, 342 N.C. 651, 467 S.E.2d 703 (1996). “[T]he full Commission is the sole judge of the weight and credibility of the evidence....” Deese v. Champion Int’l Corp., 352 N.C. 109, 116, 530 S.E.2d 549, 553 (2000) (citing Adams v. AVX Corp., 349 N.C. 676, 680-81, 509 S.E.2d 411, 413-14 (1998)). “[T]he Commission does not have to explain its findings of fact by attempting to distinguish which evidence or witnesses it finds credible.” Id. This Court reviews the Commission’s conclusions of law de novo. Griggs v. E. Omni Constructors, 158 N.C. App. 480, 483, 581 S.E.2d 138, 141 (2003).
Under the Workers’ Compensation Act, a compensable occupational disease includes “[a]ny disease . . . proven to be due to causes and conditions which are characteristic of and peculiar to a particular trade, occupation or employment, but excluding all ordinary diseases of life to which the general public is equally exposed outside of the employment.” N.C.G.S. § 97-53(13) (2001).
For a disease to be occupational under G.S. 97-53(13) it must be (1) characteristic of persons engaged in the particular trade or occupation in which the claimant is engaged; (2) not an ordinary disease of life to which the public generally is equally exposed with those engaged in that particular trade or occupation; and (3) there must be “a causal connection between the disease and the [claimant’s] employment.”
[642]*642Rutledge v. Tultex Corp., 308 N.C. 85, 93, 301 S.E.2d 359, 365 (1983) (quoting Hansel v. Sherman Textiles, 304 N.C. 44, 52, 283 S.E.2d 101, 105-06 (1981)). “[T]he first two elements are satisfied if, as a matter of fact, the employment exposed the worker to a greater risk of contracting the disease than the public generally.” Id. at 93-94, 301 S.E.2d at 365. Proof of the third element, causal connection between the disease and the employee’s occupation, often will be based on circumstantial evidence. Booker v. Duke Med. Ctr., 297 N.C. 458, 476, 256 S.E.2d 189, 200 (1979). “Among the circumstances which may be considered are the following: (1) the extent of exposure to the disease or disease-causing agents during employment, (2) the extent of exposure outside employment, and (3) absence of the disease prior to the work-related exposure as shown by the employee’s medical history.” Id.
Plaintiff first contends that the competent record evidence compelled a finding that his employment placed him at an increased risk of contracting hepatitis C. This is so, plaintiff argues, because (1) raw sewage came into contact with plaintiff’s cuts and abrasions, (2) plaintiff testified that he has not engaged in other risk-enhancing behavior, and (3) plaintiff’s treating physician, Dr. Newton, offered an expert opinion that plaintiff’s employment resulted in his illness.
The Commission found that plaintiff’s employment did not place him at an increased risk of contracting hepatitis based in large part on the deposition testimony of defendant’s expert witness, Dr. Campbell. Dr. Campbell testified that exposure to sewer water has not been linked to the transmission of hepatitis C. Dr. Campbell also testified that hepatitis C does not survive outside of a host body for any significant amount of time, that transmission usually requires exposure of the skin to fairly large volumes of infected blood, and that no evidence exists that exposure to diluted amounts of infected blood can transmit hepatitis C. Dr. Campbell concluded that he could not identify plaintiff’s job as the source of hepatitis C infection because he had seen no evidence of direct exposure to infected blood.
Dr. Campbell’s testimony is competent evidence which supports the Commission’s finding that plaintiff was not at an increased risk of contracting hepatitis C as a result of his employment-related contact with raw sewage. We cannot overrule the Commission’s findings of fact merely because plaintiff presented evidence which would support a contrary finding. See Pittman, 132 N.C. App. at 156, 510 S.E.2d at 709.
[643]*643Plaintiff next contends that the Commission erred in concluding that his hepatitis C infection was not caused by his employment. The gravamen of this contention is that the Commission should have given greater weight to the deposition testimony of plaintiff’s expert witness, Dr. Newton, than to defendant’s expert witness, Dr. Campbell. This is so, plaintiff argues, because Dr. Newton actually treated plaintiff while Dr. Campbell reviewed material about plaintiff submitted to him by defense counsel.
“[T]he Commission does not have to explain its findings of fact by attempting to distinguish which evidence or witnesses it finds credible.” Deese, 352 N.C. at 116, 530 S.E.2d at 553. In the present case, however, the Commission did explain its assessment of the credibility of the witnesses; the findings of fact indicate that the Commission found Dr. Campbell’s testimony more persuasive than Dr. Newton’s tetimony. As already indicated, Dr. Campbell’s testimony is competent record evidence which supports the Commission’s findings of fact. These findings of fact support the Commission’s conclusion that compensation is unwarranted.
The assignments of error are overruled. The Industrial Commission’s opinion and award is
Affirmed.
Judge WYNN dissents.
Judge TYSON concurs.